Happening @ Michigan https://events.umich.edu/list/rss RSS Feed for Happening @ Michigan Events at the University of Michigan. Quantitative Biology Seminar | Lineage tracing in cellular reprogramming reveals selective dynamics (April 19, 2019 11:00am) https://events.umich.edu/event/63147 63147-15578798@events.umich.edu Event Begins: Friday, April 19, 2019 11:00am
Location: West Hall
Organized By: Department of Physics

Cellular reprogramming is a phenomenon where mature, specialized cells can be reprogrammed to immature cells capable of developing into all tissues of the body. Do cells individual cells differ in their ability to reprogram? We address this using cellular barcoding based lineage tracing, and demonstrate that reprogramming dynamics in large "interacting" populations are dominated by “elite” clones [1]. This work highlights the importance of cellular interactions and/or epigenetic heterogeneity in fate programming outcomes. In contrast, tissue regeneration in animals exhibit neutral dynamics between the underlying population of stem cells [2]. Taken together, we show that looking at cell fate transition from the lens of eco-evolutionary lens shed light on underlying biology.

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Workshop / Seminar Fri, 19 Apr 2019 18:15:32 -0400 2019-04-19T11:00:00-04:00 2019-04-19T12:00:00-04:00 West Hall Department of Physics Workshop / Seminar West Hall
HEP-Astro Seminar | Picosecond Timing: extending the physics potential of the High Luminosity LHC with the CMS MIP timing detector (April 22, 2019 4:00pm) https://events.umich.edu/event/63020 63020-15536914@events.umich.edu Event Begins: Monday, April 22, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

The High Luminosity Large Hadron Collider (HL-LHC) is an upgrade to the Large Hadron Collider at CERN, which will extend the accelerator's potential for new discoveries in physics. This upgrade will increase the rate of collisions by a factor of five beyond the original design value and the total collisions created by a factor ten. To meet the challenging conditions of the HL-LHC, the Compact Muon Solenoid (CMS) detector is undergoing an extensive Phase 2 Upgrade program. In particular, a new precision timing detector with hermetic coverage up to a pseudo-rapidity of |η|=3 will measure minimum ionizing particles (MIPs) with a time resolution of 30-40 ps. This measurement of the time coordinate will reduce the effects of the high levels of pile-up expected at the HL-LHC and bring new capabilities to the CMS detector. In this seminar, I will discuss the impact on the HL-LHC physics program as well as the design and technology of this new detector.

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Workshop / Seminar Mon, 22 Apr 2019 18:15:25 -0400 2019-04-22T16:00:00-04:00 2019-04-22T17:00:00-04:00 West Hall Department of Physics Workshop / Seminar West Hall
Special Life After Graduate School Seminar | Applied Physics Applied (April 23, 2019 12:00pm) https://events.umich.edu/event/63256 63256-15603734@events.umich.edu Event Begins: Tuesday, April 23, 2019 12:00pm
Location: West Hall
Organized By: Department of Physics

Catalin Florea (Applied Physics PhD, 2002) will share notes on his (non-academic) early and mid-career path – from landing the first job deep into Midwest, to working now in R&D for a Fortune 100 company. Achievements and setbacks will be discussed, and an informal Q & A session will provide an opportunity to connect with the speaker.

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Workshop / Seminar Tue, 23 Apr 2019 18:15:26 -0400 2019-04-23T12:00:00-04:00 2019-04-23T13:00:00-04:00 West Hall Department of Physics Workshop / Seminar West Hall
CM-AMO Seminar | The precision frontier: hunting for new short-range forces with AMO-based sensors (April 23, 2019 4:00pm) https://events.umich.edu/event/63282 63282-15611985@events.umich.edu Event Begins: Tuesday, April 23, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

We normally think of large accelerators and massive detectors when we consider the frontiers of elementary particle physics, pushing to understand the universe at higher and higher energy scales. However, several tabletop low-energy experiments are positioned to discover a wide range of new physics beyond the Standard model, where feeble interactions require precision measurements rather than high energies. In high vacuum, optically-levitated dielectric nanospheres achieve excellent decoupling from their environment, making force sensing at the zeptonewton level (10^{-21} N) achievable. In this talk I will describe our progress towards using these sensors for tests of the Newtonian gravitational inverse square law at micron length scales. Optically levitated dielectric objects show promise for a variety of other applications, including searches for gravitational waves. Finally, I will discuss the Axion Resonant InterAction Detection Experiment (ARIADNE), a precision magnetometry experiment using laser-polarized 3-He gas to search for a notable dark-matter candidate: the QCD axion. ​

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Workshop / Seminar Tue, 23 Apr 2019 18:15:26 -0400 2019-04-23T16:00:00-04:00 2019-04-23T17:00:00-04:00 West Hall Department of Physics Workshop / Seminar West Hall
HET Brown Bag | Finding String Theory from the Large N Bootstrap (April 24, 2019 12:00pm) https://events.umich.edu/event/76370 76370-19711135@events.umich.edu Event Begins: Wednesday, April 24, 2019 12:00pm
Location: Randall Laboratory
Organized By: Leinweber Center for Theoretical Physics

I will discuss some recent methods for computing nonplanar CFT correlators, dual to one-loop amplitudes in AdS. This will include two applications to string theory: first, the development of a novel approach to computing perturbative string amplitudes; and second, a rigorous way to count the number of "large'' extra dimensions in the gravity dual of a strongly coupled, large N CFT.

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Lecture / Discussion Mon, 31 Aug 2020 12:13:04 -0400 2019-04-24T12:00:00-04:00 2019-04-24T13:00:00-04:00 Randall Laboratory Leinweber Center for Theoretical Physics Lecture / Discussion Randall Laboratory
Department Colloquium | Axion Dark Matter and Neutrinoless Double-Beta Decay: New Techniques for New Physics (April 24, 2019 4:00pm) https://events.umich.edu/event/60195 60195-14849034@events.umich.edu Event Begins: Wednesday, April 24, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

Two of the biggest open questions in the Standard Model of Particle Physics are: is the neutrino its own antiparticle, a Majorana particle, and is Peccei-Quinn Symmetry with the resulting axion the solution to the strong CP problem. The answer to these questions is a portal to new physics and the answer to the even bigger questions of the generation of the matter-antimatter asymmetry and the nature of dark matter. My group works to address these questions with searches for neutrinoless double-beta decay and ultra-light axions. In this talk, I will review the physics that connects these two efforts, the current status of the fields, and our R&D efforts towards the next-generation experiments.

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Workshop / Seminar Wed, 24 Apr 2019 18:15:23 -0400 2019-04-24T16:00:00-04:00 2019-04-24T17:00:00-04:00 West Hall Department of Physics Workshop / Seminar West Hall
Special HEP-Astro Seminar | The quest for the Axion (April 25, 2019 12:00pm) https://events.umich.edu/event/63185 63185-15587259@events.umich.edu Event Begins: Thursday, April 25, 2019 12:00pm
Location: Randall Laboratory
Organized By: Department of Physics

Axions and axion-like particles are excellent dark matter candidates, spanning a vast range of mass scales from the milli- and micro-eV for the QCD axion, to 1E-22 eV for ultralight axions in string theory. In some scenarios, inhomogeneities in the axion density lead to the formation of compact structures known as axion “miniclusters” and axion stars. I will first discuss astrophysical and cosmological constraints on axions at either end of this spectrum, using data from the cosmic microwave background anisotropies and the effects of miniclusters on the gravitational microlensing and on direct detection. I will then assess the formation and the evolution of axion stars in various astrophysical regimes.

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Workshop / Seminar Thu, 25 Apr 2019 18:15:24 -0400 2019-04-25T12:00:00-04:00 2019-04-25T13:00:00-04:00 Randall Laboratory Department of Physics Workshop / Seminar Randall Laboratory
CM Theory Seminar | Towards exciton optomechanics in suspended 2D semiconductors (April 25, 2019 4:00pm) https://events.umich.edu/event/62425 62425-15364107@events.umich.edu Event Begins: Thursday, April 25, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

Excitons, made of electron-hole pairs bound by Coulomb interaction, provide compelling opportunities for applications in optoelectronics, information storage, non-volatile logic. However, the small binding energy of exciton in conventional semiconductors jeopardizes its integration and potentials in modern optoelectronics schemes. In the past decade, a new type of two-dimensional semiconductors, mainly transition metal dichalcogenides (TMDs), attract tremendous interests with much larger exciton binding energy. Thus, stable excitonic effects up to room temperature can give rise to extremely strong light-matter interaction. Together with their ultra-lightweight and other emerging properties, such strong excitonic interaction in 2D TMD opens up the possibility to optically control properties of monolayer semiconductors over the suspended structure.

In this talk, I will first review this new type of 2D semiconductors and interesting device physics by employing the structure of nanoelectromechanical systems (NEMS). Then I’ll present our study of exciton-induced nonlinearities in suspended TMD monolayers, where we achieved a robust optical bistability near the exciton resonance. Our results also demonstrate a helicity-dependent optical switching that enables control of light not only by light intensity but also by its polarization using monolayer materials. Additionally, I will discuss our recent results on dynamically manipulating the mechanical motion of a suspended 2D semiconductor through its exciton resonance, without an optical cavity structure.

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Workshop / Seminar Thu, 25 Apr 2019 18:15:24 -0400 2019-04-25T16:00:00-04:00 2019-04-25T17:00:00-04:00 West Hall Department of Physics Workshop / Seminar West Hall
CSAAW Workshop Special Guest Speaker will talk on paper crumpling dynamics (April 26, 2019 12:00pm) https://events.umich.edu/event/63178 63178-15585198@events.umich.edu Event Begins: Friday, April 26, 2019 12:00pm
Location: Weiser Hall
Organized By: The Center for the Study of Complex Systems

When describing the dynamics of a sheet of paper being crumpled one may be tempted to only take the elastic response of the thin sheet into account and consider only those deformations which minimize the elastic energy of the crumpled sheet. However, most materials yield and deform plastically, leaving permanent scars in the thin sheet. Indeed, the simple process of crumpling a sheet of paper with our hands results in a complex network of interconnected permanent creases of many sizes and orientations, along which the sheet preferentially bends. Thereby, history dependence is introduced into the system. I will present an experimental study of the dynamics of crumpling. Specifically, we investigate how a crease network evolves when a thin elastoplastic sheet is repeatedly crumpled, opened up and then re-crumpled. Is there a maximally crumpled state after which the sheet can be crumpled without further plastic deformations, or do creases and defects keep accumulating forever? Surprisingly, we find that much of the complex dynamics of the crease patterns can be captured using one simple global measure, which is independent of the crumpling history.

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Workshop / Seminar Tue, 16 Apr 2019 11:04:37 -0400 2019-04-26T12:00:00-04:00 2019-04-26T13:00:00-04:00 Weiser Hall The Center for the Study of Complex Systems Workshop / Seminar CSAAW logo
Informal HEP-Astro Seminar | Paleo Detectors - Digging for Dark Matter (April 29, 2019 4:00pm) https://events.umich.edu/event/63406 63406-15671658@events.umich.edu Event Begins: Monday, April 29, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

Direct detection experiments have delivered impressive limits on the interaction strength of dark matter with nuclei. A large experimental program is underway to extend the sensitivity of direct detection experiments, however, such experiments are becoming increasingly difficult and costly. Recently, we proposed paleo-detectors as analternative approach to the direct detection of dark matter: Instead of searching for dark matter induced nuclear recoils in a real-time laboratory experiment, we propose to search for the traces of dark matter interactions recorded in ancient minerals over geological time-scales. In this talk I will discuss this proposal, including ways to mitigate backgrounds and methods to read out tracks from ancient minerals. I will also briefly discuss some preliminary results for applications of paleo-detectors beyond dark matter, e.g. for searching for neutrinos from core collapse supernovae.

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Workshop / Seminar Mon, 29 Apr 2019 18:15:17 -0400 2019-04-29T16:00:00-04:00 2019-04-29T17:00:00-04:00 West Hall Department of Physics Workshop / Seminar West Hall
HET Brown Bag Seminar | Finding String Theory from the Large N Bootstrap (May 1, 2019 12:00pm) https://events.umich.edu/event/63423 63423-15692041@events.umich.edu Event Begins: Wednesday, May 1, 2019 12:00pm
Location: Randall Laboratory
Organized By: Department of Physics

Professor Perlmutter will discuss some recent methods for computing nonplanar CFT correlators, dual to one-loop amplitudes in AdS. This will include two applications to string theory: first, the development of a novel approach to computing perturbative string amplitudes; and second, a rigorous way to count the number of "large'' extra dimensions in the gravity dual of a strongly coupled, large N CFT.

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Workshop / Seminar Mon, 29 Apr 2019 10:38:34 -0400 2019-05-01T12:00:00-04:00 2019-05-01T13:00:00-04:00 Randall Laboratory Department of Physics Workshop / Seminar Randall Laboratory
Special CM Theory Seminar | Study of the Dirac material candidates in high magnetic fields (May 9, 2019 4:00pm) https://events.umich.edu/event/63456 63456-15710550@events.umich.edu Event Begins: Thursday, May 9, 2019 4:00pm
Location: Randall Laboratory
Organized By: Department of Physics

In this talk, I will focus on two series of Dirac candidates, (V,Nb,Ta)Al3 and CeSb(Se,Te). VAl_3 families are predicted as the type II Dirac semimetals where the Dirac bands are strongly tilted; therefore violate Lorentz-symmetry and have no analogue in high energy physics. CeSbTe were reported with multi Dirac/Weyl bands which can be tuned by magnetic fields.

By measuring de Hass-van Alphen effect using torque magnetomery in VAl_3 families. It revealed the existence of tilted Dirac cones with Dirac type-II nodes located at 100, 230 and 250 meV away from the Fermi level of VAl_3, NbAl_3, and TaAl_3, respectively. These results are consistent with earlier band structure calculations, which also predict a non-trivial electronic topology. However, for all three compounds we find that the cyclotron orbits on the Fermi surfaces, including an orbit nearly enclosing the Dirac type-II node, yield trivial Berry phases. We will show that in order to determine the Berry phases, the overall understanding of the topology of the Fermi surfaces and the g-factors are required.

CeSbSe shows magnetization plateaus between the antiferromagnetic states (M = 0) and the magnetization saturated states M_{sat}. The fractional plateau values of M/M_{sat} are equal to 1/6, 1/3, 5/12, 1/2, and 3/4. I will discuss a possible explanation between the magnetization plateaus and the magnetic structures of CeSbSe from the single crystal neutron diffraction data.

References:

[1] K.-W. Chen (1,2), X. Lian (1,2), Y. Lai (1,2), N. Aryal (1,2), Y.-C. Chiu (1,2), W. Lan (1,2), D. Graf (1), E. Manousakis (1,2), R. E. Baumbach (1,2), and L. Balicas (1,2), Phys. Rev. Lett. 120, 206401(2018).

[2] K.-W. Chen (1,2), Y. Lai (1,2), Y.-C. Chiu (1,2), S. Steven (3), T. Besara (1), D. Graf (1), T. Siegrist (1,4), T. E. Albrecht-Schmitt (3), L. Balicas (1,2), and R. E. Baumbach (1,2), Phys. Rev. B 96, 014421 (2017).


1 National High Magnetic Field Laboratory, Florida State University, Florida, USA
2 Department of Physics, Florida State University, Florida, USA
3 Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, USA
4 Department of Chemical and Biomedical Engineering, FAMU-FSU College of Engineering, Tallahassee, Florida 32310, USA


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Workshop / Seminar Thu, 09 May 2019 18:15:18 -0400 2019-05-09T16:00:00-04:00 2019-05-09T17:00:00-04:00 Randall Laboratory Department of Physics Workshop / Seminar Randall Laboratory
Special HEP-Astro Seminar | Searching for Dark Matter from the Lowest to the Highest Energies (May 13, 2019 1:00pm) https://events.umich.edu/event/63481 63481-15726893@events.umich.edu Event Begins: Monday, May 13, 2019 1:00pm
Location: West Hall
Organized By: Department of Physics

Dark Matter (DM) is a long standing puzzle in fundamental physics and goal of a diverse research program. In underground experiments such as LZ we search for DM directly using lowest possible energy thresholds, at the LHC we seek to produce dark matter at the very highest energies, and using telescopes we look for telltale signatures in the cosmos. All these detection methods probe different parts of the possible parameters space with complementary strengths. I will present current DM searches, their connection and how an interdisciplinary program bridging different experimental frontiers can achieve optimal sensitivity. Finally, I will highlight recent theoretical and experimental developments and the near term discovery prospects in upcoming experiments.

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Workshop / Seminar Fri, 03 May 2019 15:06:58 -0400 2019-05-13T13:00:00-04:00 2019-05-13T14:30:00-04:00 West Hall Department of Physics Workshop / Seminar West Hall
Special HET Seminar | UV Cancellations in Gravity Loop Integrands (May 13, 2019 3:00pm) https://events.umich.edu/event/63571 63571-15784206@events.umich.edu Event Begins: Monday, May 13, 2019 3:00pm
Location: Randall Laboratory
Organized By: HET Seminars

TBD

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Workshop / Seminar Fri, 10 May 2019 16:01:54 -0400 2019-05-13T15:00:00-04:00 2019-05-13T16:00:00-04:00 Randall Laboratory HET Seminars Workshop / Seminar Randall Laboratory
Foundations of Modern Physics Workshop (May 14, 2019 11:30am) https://events.umich.edu/event/63498 63498-15757453@events.umich.edu Event Begins: Tuesday, May 14, 2019 11:30am
Location: Mason Hall
Organized By: Department of Philosophy

11:30 AM: AJ Kuhr, "On the explanatory (in?)adequacy of lattice QCD"
12:20 PM: Lunch (catered)
01:10 PM: Dave Baker, "On symmetries"
02:15 PM: Anthony Della Pella, "Partition functions in Stat Mech and Comp Sci"
03:05 PM: Coffee break
03:25 PM: Gabriele Carcassi, "On the role of math in scientific theories"
04:15 PM: Josh Hunt, "Modern methods for scattering amplitudes"

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Workshop / Seminar Tue, 07 May 2019 13:31:26 -0400 2019-05-14T11:30:00-04:00 2019-05-14T17:00:00-04:00 Mason Hall Department of Philosophy Workshop / Seminar Mason Hall
Special Data Visualization Workshop (May 14, 2019 3:00pm) https://events.umich.edu/event/63524 63524-15775923@events.umich.edu Event Begins: Tuesday, May 14, 2019 3:00pm
Location: West Hall
Organized By: Physics Workshops & Conferences

Scientific research can be a slow and laborious process. The absolute final step in the process is to then communicate your exciting scientific findings to other scientists both in and outside of your field. Yet it is sometimes at this final step where the least amount of time is spent. In this interactive 90-min workshop, I will give a basic introduction to making scientific figures using Adobe Illustrator and Blender3D. I will go over the basics of these software, how they treat objects, and the useful hotkeys for speeding up workflow. In the first hour, I will introduce Illustrator and cover topics like workflow; importing external plots/figures; creating patterns (i.e. schematic atomic lattices); and creating 3D structures. In the last half-hour I will give a brief introduction to Blender, a powerful (and free) open-source software for rendering 3D objects. I will go over the basics of how Blender treats objects/structures, lighting, and rendering a scene.

**All are welcome, but it is strongly recommended that participants bring laptops with Adobe Illustrator CC (or at least CS6) and Blender3D pre-installed so that you can follow along with the demos.**

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Workshop / Seminar Thu, 09 May 2019 15:57:54 -0400 2019-05-14T15:00:00-04:00 2019-05-14T16:30:00-04:00 West Hall Physics Workshops & Conferences Workshop / Seminar An introduction to making scientific figures with Illustrator & Blender
Physics Graduate Student Symposium (PGSS) | Quantum Oscillations in Electrical Resistivity in Kondo Insulators (May 16, 2019 12:00pm) https://events.umich.edu/event/63620 63620-15816694@events.umich.edu Event Begins: Thursday, May 16, 2019 12:00pm
Location: West Hall
Organized By: Department of Physics

In metals, orbital motions of conduction electrons on the Fermi surface are quantized in magnetic fields, which is manifested by quantum oscillations in electrical resistivity. This Landau quantization is generally absent in insulators. Here we report a notable exception in an insulator — ytterbium dodecaboride (YbB12). The resistivity of YbB12exhibits distinct quantum oscillations despite having a much larger magnitude than in metals [1]. This unconventional oscillation is shown to arise from the insulating bulk, even though the temperature dependence of the oscillation amplitude follows the conventional Fermi liquid theory of metals. The large effective masses indicate the presence of a Fermi surface consisting of strongly correlated electrons. Quantum oscillations are also observed in the magnetization of YbB12 [1]. Our result reveals a mysterious dual nature of the ground state in YbB12: it is both a charge insulator and a strongly correlated metal.

[1] Z. xiang et al., Science 362, 65 (2018).

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Lecture / Discussion Tue, 14 May 2019 15:03:22 -0400 2019-05-16T12:00:00-04:00 2019-05-16T13:00:00-04:00 West Hall Department of Physics Lecture / Discussion West Hall
Special Astronomy/Physics Seminar | Tidal Stellar Streams as Probes of Dark Matter: Detection and Dynamical Analysis (May 20, 2019 12:00pm) https://events.umich.edu/event/63696 63696-15824935@events.umich.edu Event Begins: Monday, May 20, 2019 12:00pm
Location: West Hall
Organized By: Department Colloquia

Tidal stellar streams have gained a lot of popularity in the field of astrophysics. These orbit-like structures, that are formed by the tidal disruption of a globular cluster or a satellite galaxy by the potential of the host galaxy, serve as “fossils” that encode information regarding the accretion history of our Galaxy. Recently, it has also been realized that analysis of the morphology and dynamics of star streams provide powerful means to constrain the Milky Way’s gravitational potential and its dark matter distribution, and can also be useful in probing the very nature of the dark matter particle itself.

The talk is intended to provide a short introduction on “stellar stream” systems and their importance in various scientific studies. The other highlight of the talk would be the STREAMFINDER algorithm (an algorithm designed to detect stellar streams in the astrophysical catalogues) and the new panoramic sky map of the stellar streams of the Milky Way halo that we obtained by analyzing ESA/Gaia DR2. Towards the end, I will also mention some of the recent studies that I have been involved in which also employ stellar streams.

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Workshop / Seminar Wed, 15 May 2019 16:28:20 -0400 2019-05-20T12:00:00-04:00 2019-05-20T13:00:00-04:00 West Hall Department Colloquia Workshop / Seminar West Hall
Physics Graduate Student Symposium (PGSS) | Status on the Search for the Rare Kaon Decay, K_L→ π^0νν (May 23, 2019 12:00pm) https://events.umich.edu/event/63737 63737-15841200@events.umich.edu Event Begins: Thursday, May 23, 2019 12:00pm
Location: West Hall
Organized By: Department Colloquia

The KOTO experiment at the J-PARC research facility in Tokai, Japan aims to observe and measure the rare decay of the neutral kaon, K_L→π^0νν. This decay has a very small Standard Model predicted branching ratio of 3 x 10^{-11} which is why it has never been experimentally observed. While this decay is extremely rare, it is one of the best decays for studying charge-parity violation, which can tell us about the matter and antimatter asymmetry that we see in the universe today. In this talk, I will explain the details of how KOTO searches for this rare decay and present new results from the collaboration published in January 2019 as well as preliminary results from the current analysis.

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Workshop / Seminar Fri, 17 May 2019 14:59:05 -0400 2019-05-23T12:00:00-04:00 2019-05-23T13:00:00-04:00 West Hall Department Colloquia Workshop / Seminar West Hall
GusFest (May 23, 2019 6:00pm) https://events.umich.edu/event/64733 64733-16436934@events.umich.edu Event Begins: Thursday, May 23, 2019 6:00pm
Location: Off Campus Location
Organized By: Leinweber Center for Theoretical Physics

LOC Chair Dragan Huterer

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Conference / Symposium Tue, 20 Aug 2019 13:32:29 -0400 2019-05-23T18:00:00-04:00 2019-05-23T22:00:00-04:00 Off Campus Location Leinweber Center for Theoretical Physics Conference / Symposium
GusFest (May 24, 2019 9:00am) https://events.umich.edu/event/64733 64733-16436935@events.umich.edu Event Begins: Friday, May 24, 2019 9:00am
Location: West Hall
Organized By: Leinweber Center for Theoretical Physics

LOC Chair Dragan Huterer

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Conference / Symposium Tue, 20 Aug 2019 13:32:29 -0400 2019-05-24T09:00:00-04:00 2019-05-24T22:00:00-04:00 West Hall Leinweber Center for Theoretical Physics Conference / Symposium West Hall
Special HEP-Astro Seminar | Super Tau Charm Factory(STCF): A Precision Frontier for Particle Physics (May 28, 2019 10:30am) https://events.umich.edu/event/63638 63638-15824835@events.umich.edu Event Begins: Tuesday, May 28, 2019 10:30am
Location: West Hall
Organized By: Department of Physics

A e^+e^-collider that covers the center of mass energy of 2-7 GeV and has a luminosity of 10^{35} cm^{-2} s^{-1} could produce billions of charmonia, charmed baryon pairs and tau lepton pairs right at their production thresholds, which could be the unique data for systematically study physics with Charm quark and tau lepton, in particular the study of the hadron structure, search for exotic hadrons like glueball, hybrid and multi-quark-states, as well as new physics that is beyond the Standard Model through high precision measurements. This presentation will briefly introduce the STCF, mainly its physics motivation, the conception design of the machine and detector, as well as its current status of the project promotion in the world.

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Workshop / Seminar Tue, 28 May 2019 18:15:23 -0400 2019-05-28T10:30:00-04:00 2019-05-28T11:30:00-04:00 West Hall Department of Physics Workshop / Seminar West Hall
Physics Graduate Student Symposium (PGSS) | Multi-Scale Problems in Quantum Chromodynamics (May 30, 2019 12:00pm) https://events.umich.edu/event/63814 63814-15896408@events.umich.edu Event Begins: Thursday, May 30, 2019 12:00pm
Location: East Hall
Organized By: Department Colloquia

The origin of structure in the proton still evades a detailed description by first-principles calculations. Instead, the structure is extracted from global fits to its data. In proton-proton collisions, the current extraction procedure relies on our ability to independently describe each proton. It has been predicted, however, that correlations between two protons prohibit an independent description of each proton in certain scattering processes. These correlations may provide a powerful source of insight into the origin of collective structures in strongly-bound few-body systems. In this talk, I will explain how to probe these correlations and present measurements by the PHENIX experiment at Brookhaven National Lab in Long Island, New York. Measurements are also planned by the LHCb experiment at CERN in Geneva, Switzerland.

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Conference / Symposium Fri, 24 May 2019 09:06:38 -0400 2019-05-30T12:00:00-04:00 2019-05-30T13:00:00-04:00 East Hall Department Colloquia Conference / Symposium East Hall
Physics Graduate Student Symposium (PGSS) | Nonlinear Optical Effects in Weyl Semimetals (June 6, 2019 12:00pm) https://events.umich.edu/event/63879 63879-15977780@events.umich.edu Event Begins: Thursday, June 6, 2019 12:00pm
Location: East Hall
Organized By: Department Colloquia

Weyl semimetals lie at the intersection of strongly correlated materials and materials with nontrivial spin-orbit coupling. These topological materials have attracted a lot of interest in the last several years because of their wide variety of novel properties and resulting potential applications. In this talk, I will begin by presenting a brief overview of the unique band structure and topology of these materials. Then I will go on to examine a couple of their nonlinear optical properties and highlight past and proposed experiments to further explore this novel state of matter.

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Conference / Symposium Mon, 03 Jun 2019 08:30:43 -0400 2019-06-06T12:00:00-04:00 2019-06-06T13:00:00-04:00 East Hall Department Colloquia Conference / Symposium East Hall
Physics Graduate Student Symposium (PGSS) | The Role of Cell-Cell Contacts in Pattern Formation in Tissues: from Juvenile Zebrafish to Mammalian Embryos (June 13, 2019 12:00pm) https://events.umich.edu/event/63939 63939-16009598@events.umich.edu Event Begins: Thursday, June 13, 2019 12:00pm
Location: East Hall
Organized By: Department Colloquia

Many physicists see biology as very complex and messy, and often it is. Certain problems in biology, though, serve as an elegant playground for physicists to develop quantitative AND predictive models. For example, problems in biology in which cells generate forces to perform some function allow physicists to make ourselves useful to biologists, our collaborators. In this talk, I will take you on a journey from the retinae of juvenile zebrafish to the outer tissue layer of developing mammalian embryos. In juvenile zebrafish, the cone photoreceptors in retinae form a precise crystalline lattice based on subtype (i.e., sensitivity to different wavelengths of light). We find that the defects in this lattice form lines, called grain boundaries, as the pattern forms, not by subsequent defect motion. Based on this observation, we propose a model in which cells of fixed fate (i.e., subtype) contact their neighbors of the same subtype, generating active forces for building the crystal. From there, I will take you to an example in which cell fate is not fixed. In this stem cell culture system, without any imposed chemical gradients and in the absence of many known endogenous gradients, cells of initially unspecified fate differentiate into two types, with one type localized to a ring at the boundary. We propose a model for this system in which mechanical stress biases fate and fate determines contractility. The role of cell-cell contacts and mechanics in pattern formation in developing tissues remains poorly understood. Luckily for us physicists, these problems provide endless intellectual stimulation.

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Conference / Symposium Fri, 07 Jun 2019 09:54:07 -0400 2019-06-13T12:00:00-04:00 2019-06-13T13:00:00-04:00 East Hall Department Colloquia Conference / Symposium East Hall
Summer Omics Learning Seminar Series - Co-Sponsored by the M-LEEaD Omics, Bioinformatics Core, and the Department of Computational Medicine & Bioinformatics (July 9, 2019 11:00am) https://events.umich.edu/event/63537 63537-15782025@events.umich.edu Event Begins: Tuesday, July 9, 2019 11:00am
Location: School of Public Health Bldg I and Crossroads and Tower
Organized By: DCMB Seminar Series

Adductomics

"Strategies and approaches for human biomonitoring of environmental and dietary carcinogens"

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Lecture / Discussion Fri, 10 May 2019 11:56:21 -0400 2019-07-09T11:00:00-04:00 2019-07-09T12:00:00-04:00 School of Public Health Bldg I and Crossroads and Tower DCMB Seminar Series Lecture / Discussion School of Public Health Bldg I and Crossroads and Tower
Physics Graduate Student Symposium (PGSS) | Rapid Scanning AOM Modulation-Based Linear Measurements to Derive the Linear Absorption Spectra of Purple Bacteria (July 11, 2019 12:00pm) https://events.umich.edu/event/64208 64208-16212196@events.umich.edu Event Begins: Thursday, July 11, 2019 12:00pm
Location: West Hall
Organized By: Department Colloquia

Photosynthesis is a vital process that forms the basis of most life and energy sources on the planet. The knowledge of the underlying mechanisms of charge and energy transfer involved in this process can be used to develop artificial light-harvesting systems and biofuels, helping us to meet our own energy needs. In this talk, I will discuss how we use fluorescence-detection-based two-dimensional electronic spectroscopy (F-2DES) to study the energy transfer in light-harvesting (LH2, in particular) complexes present in photosynthetic purple bacteria. Due to long acquisition times, photobleaching effects during the 2D measurements can distort the features of the acquired spectra. Motivated by the desire to reduce these effects without sacrificing the signal-to-noise ratio (SNR), we have adapted a rapid-scanning approach to record the linear spectra of the complexes in question. I will discuss the technique and results from the same. Extending this rapid-scanning technique to F-2DES promises reduced acquisition times and improved SNR for the 2D spectra.

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Conference / Symposium Fri, 19 Jul 2019 08:50:54 -0400 2019-07-11T12:00:00-04:00 2019-07-11T13:00:00-04:00 West Hall Department Colloquia Conference / Symposium West Hall
A Phase Transition in Network Community Inference (July 18, 2019 12:00pm) https://events.umich.edu/event/64251 64251-16266505@events.umich.edu Event Begins: Thursday, July 18, 2019 12:00pm
Location: West Hall
Organized By: Department Colloquia

Decomposing a network into communities (a partition of the vertices such that there is a significantly higher density of connections within groups than between groups) has been a subject of great interest in the network science community due to its numerous applications in data compression and machine learning. For many real networks, however, we do not know the "true" community labels, and so one way of assessing whether a community detection algorithm works well or not is to frame the task as an inference problem: there is a set of nodes with artificially assigned "ground truth" community labels, from which a network is created through some probabilistic generative process, and the goal is to recover this structure using only the network and the algorithm of interest. Intuitively, if a graph is too sparsely connected or it is generated from a noisy process, we should fail to recover partitions that are correlated with our artificial ground truth. In this talk I discuss an interesting phenomenon in which it suddenly (in terms of a control parameter) becomes impossible to recover the true communities in a graph, even when they are explicitly planted in its topology! This abrupt qualitative change in the difficulty of the community detection problem is characterized by a phase transition analogous to that in a generalized Potts model in statistical mechanics, which can be derived from a statistical physics perspective using a free energy approximation and the cavity method. I will also discuss future work in this area and its implications for nonconvex optimization.

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Workshop / Seminar Tue, 09 Jul 2019 09:33:02 -0400 2019-07-18T12:00:00-04:00 2019-07-18T13:00:00-04:00 West Hall Department Colloquia Workshop / Seminar West Hall
Constraining Neutrino Properties with the Cosmic Microwave Background (July 25, 2019 12:00pm) https://events.umich.edu/event/64422 64422-16346367@events.umich.edu Event Begins: Thursday, July 25, 2019 12:00pm
Location: West Hall
Organized By: Department Colloquia

Neutrinos are one half of the leptons included in the standard model of particle physics yet some of their properties are the most poorly constrained aspects of the standard model. Neutrinos are also important in the cosmological standard model due to their suppression of the growth of structure at small angular scales and their influence on the evolution of early universe. The cosmic microwave background (CMB) is one of the best probes we have at observing the effects of neutrinos on the growth of large scale structure and by observing those effects we in turn can place tight constraints on two elusive properties of neutrinos, the sum of their masses and the number of different species. In my talk I’ll introduce both properties of the neutrino and the CMB, the effects neutrinos have on large scale structure that leave imprints on the CMB, current and future missions to observe those effects, and my experimental contributions to those missions.

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Workshop / Seminar Fri, 19 Jul 2019 08:51:33 -0400 2019-07-25T12:00:00-04:00 2019-07-25T13:00:00-04:00 West Hall Department Colloquia Workshop / Seminar West Hall
U-M Ideas Lab: Informational Webinar on Predicting Human Performance (July 31, 2019 11:00am) https://events.umich.edu/event/64096 64096-16147464@events.umich.edu Event Begins: Wednesday, July 31, 2019 11:00am
Location: Michigan League
Organized By: Biosciences Initiative

Attend this webinar to learn more about the 2019 Biosciences Initiative U-M Ideas Lab: Predicting Human Performance.

Experts will:
- present background surrounding the Ideas Lab
- explore the topic in depth
- answer questions live from the audience

Questions may be sent ahead of time to biosciences@umich.edu.
Registration for the webinar: https://zoom.us/meeting/register/e93ed8dbfacf569acde7dc3c8da9331e
On-line attendance- please register yourself and utilize your individual link for the meeting.
In-person attendance- you may register on-line or when you arrive.

About U-M Ideas Lab:
The Biosciences Initiative U-M Ideas Lab is your chance to pursue high-risk, high-reward, creative ideas and solutions to broad biosciences challenges alongside colleagues with diverse areas of expertise. Use this interactive think tank funding opportunity to pursue innovative research while still focusing on your current program and other duties.

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Workshop / Seminar Fri, 12 Jul 2019 15:01:40 -0400 2019-07-31T11:00:00-04:00 2019-07-31T12:00:00-04:00 Michigan League Biosciences Initiative Workshop / Seminar Ideas Lab Banner
The Spin Polarization History Mystery; or, History-Dependent Dynamic Nuclear Polarization in Gallium Arsenide (August 1, 2019 12:00pm) https://events.umich.edu/event/64674 64674-16426866@events.umich.edu Event Begins: Thursday, August 1, 2019 12:00pm
Location: West Hall
Organized By: Department Colloquia

Electron spin has great potential for use in electronic device applications. To that end, our research group focuses on using optical pump-probe techniques to study electron spin dynamics in semiconductor materials. My current project began with an observation of an unexpected dependence of electron spin polarization in gallium arsenide on external magnetic field history. In this talk, I will recount this mystery and how we have set out to solve it. Join me as we search for clues and interrogate the prime suspect, dynamic nuclear polarization. Along the way, I will introduce the key concepts vital to understanding our experiments. Together, we will unravel the mystery of an unexpected spin phenomenon in gallium arsenide as I present a tale of intrigue and spin dynamics.

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Conference / Symposium Mon, 29 Jul 2019 08:26:56 -0400 2019-08-01T12:00:00-04:00 2019-08-01T13:00:00-04:00 West Hall Department Colloquia Conference / Symposium West Hall
Biophysics Talk Title: Who Said To Do That? Understanding Multicellular Decision Making (August 8, 2019 11:30am) https://events.umich.edu/event/64265 64265-16274469@events.umich.edu Event Begins: Thursday, August 8, 2019 11:30am
Location: Chemistry Dow Lab
Organized By: LSA Biophysics

Abstract: One of the key outstanding challenges in understanding multicellular systems is identifying what single cells tune within themselves to change population-wide behaviors. A major driver of multicellular patterns is oscillations in single-cell signaling networks, but it is unknown what features single cells naturally modulate in these oscillations to change global patterns. An ideal system for addressing this challenge exists in the social amoeba, Dictyostelium discoideum. Dictyostelium uses travelling waves of cyclic AMP as a chemoattractant between cells to drive aggregation into a multicellular state when starving. These waves originate within single cells that release cyclic AMP to the environment, and the single-cell signaling network phenomena that drive the creation of these waves are well-characterized. Using new experimental data in conjunction with an existing phenomenological model, I explore what parameters single cells can modulate to control the properties of these signaling oscillations and the patterns they coordinate.

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Workshop / Seminar Mon, 22 Jul 2019 14:33:39 -0400 2019-08-08T11:30:00-04:00 2019-08-08T12:30:00-04:00 Chemistry Dow Lab LSA Biophysics Workshop / Seminar Chemistry Dow Lab
Physics Graduate Student Symposium | A Hearty Higgs Boson: Exploring Higgs Boson Properties Through the Refined Palette of the ATLAS Detector (August 8, 2019 12:00pm) https://events.umich.edu/event/64807 64807-16450928@events.umich.edu Event Begins: Thursday, August 8, 2019 12:00pm
Location: Weiser Hall
Organized By: Department Colloquia

The Higgs Boson is a newly introduced cuisine in the world of particle physics. We can now recognize it on the menu card of the Standard Model, but the details of its production, decay, and interactions are not yet precisely understood. I'll discuss the various recipes for creating a Higgs Boson with the Large Hadron Collider, and how these different methods affect the flavors we detect within the ATLAS detector. I'll also explore how refining our palette for Higgs Bosons can impact our broader understanding of fundamental physics.

Please Note: change in venue for this week's symposium.

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Conference / Symposium Thu, 01 Aug 2019 10:38:02 -0400 2019-08-08T12:00:00-04:00 2019-08-08T13:00:00-04:00 Weiser Hall Department Colloquia Conference / Symposium Weiser Hall
Physics Graduate Student Symposium | High Performance Micro-Sensors for Navigation-Grade MEMS Gyroscope (August 15, 2019 12:00pm) https://events.umich.edu/event/65037 65037-16507308@events.umich.edu Event Begins: Thursday, August 15, 2019 12:00pm
Location: West Hall
Organized By: Department Colloquia

GPS navigation is commonly used in many applications including defense, autonomous vehicles, and robotics. However, absolute dependence on GPS is unreliable due to its limited reachability and susceptibility to interference. For example, a jammer or even a simple and cheap device can be used to spoof GPS signal. As a result, for navigation of high-end vehicles like that of defense and military, one can’t rely entirely on GPS. To make navigation more secure and reliable, inertial sensors are used for navigation when GPS signal is unavailable. Inertial sensors consist of primarily three accelerometers and three gyroscopes in the three perpendicular axes to measure acceleration (or velocity or position) or rate (or angle) of rotation respectively for navigation. Gyroscopes are used to measure the rotation rate and angle of rotation with high precision. Commercial gyroscopes which are used in commercial flights as well as space missions are very precise in their measurement. However, their large sizes, high costs and power requirements limit their use in many applications.

MEMS or Microelectromechanical systems consists of a range of mechanical structures which can be used for various applications. They have an inherent advantage of low cost (C), weight (W), size (S) and power (P) or low CWSaP. They, however, are limited in performance due to large noise. This is a major hurdle which has been limiting the entry of MEMS inertial sensors in navigation-grade performance applications. Our research is focused on bridging this gap and making an ultra-low noise MEMS gyroscope using the microfabrication technologies.

In this talk, I will talk about the design and fabrication of miniaturized 3D shell resonators for gyroscopes. These resonators have exhibited quality factor as high as 10 million leading to very low noise gyroscope at their small size. The achieved performance matrices would enable the use of MEMS sensors as a navigation-grade gyroscope at a cost lower by several orders of magnitude than the existing commercial gyroscopes. Only this would enable each one of us to own a self-driving car and autonomous robots at our homes!

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Conference / Symposium Thu, 08 Aug 2019 10:59:38 -0400 2019-08-15T12:00:00-04:00 2019-08-15T13:00:00-04:00 West Hall Department Colloquia Conference / Symposium West Hall
Special Cosmology Seminar | Galaxy Cluster Scaling Relations with the Magneticum Simulation (August 19, 2019 3:00pm) https://events.umich.edu/event/65271 65271-16563482@events.umich.edu Event Begins: Monday, August 19, 2019 3:00pm
Location: Randall Laboratory
Organized By: HEP - Astro Seminars

Galaxy clusters are one of the most powerful cosmological tool. Their abundance as a function of cluster mass is sensitive to both the expansion history and the history of structure formation in the Universe. Various cluster observables such as X-ray luminosity, temperature and Sunyaev- Zel’dovich (SZ) effect have been shown to scale with cluster mass, therefore, can be used as a proxy of total cluster mass.

We use Magneticum simulation setup to explore the cosmology dependence of galaxy cluster scaling relations which otherwise cannot be tested by observations. We run the same simulation set-up in fifteen different cosmological environments. Our simple, cosmology dependent mass-observable scaling relation parametrisation can be used to forecast the degeneracies between the amplitude of the scaling relation and the cosmological parameters as well as to explore the combination of potential probes to break these degeneracies.

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Workshop / Seminar Thu, 15 Aug 2019 14:03:00 -0400 2019-08-19T15:00:00-04:00 2019-08-19T16:00:00-04:00 Randall Laboratory HEP - Astro Seminars Workshop / Seminar Randall Laboratory
Physics Graduate Student Symposium (PGSS) | Miniaturized Frequency Combs Enable Advanced Spectroscopies to Leave the Lab and (Maybe) Enter Orbit (August 22, 2019 12:00pm) https://events.umich.edu/event/65404 65404-16595537@events.umich.edu Event Begins: Thursday, August 22, 2019 12:00pm
Location: West Hall
Organized By: Department Colloquia

Frequency Combs, or pulsed lasers which are capable of emitting many narrow and closely spaced spectral lines (teeth) with fixed phase relationships between adjacent teeth, are an essential tool in precision metrology and spectroscopy. Their usefulness comes from the fact that their entire spectrum can be controlled by just adjusting the time between pulses and the pulse-to-pulse phase slip of their electric field. This means that, using relatively simple control schemes, frequency combs enable the most precise measurements of time and frequency possible, among a plethora of other applications. Typically, however, these light sources are roughly the size of a kitchen table and require the high stability of a lab environment to maintain the controllability of their output. Miniaturized combs exist, in the form of microscopic ring resonators, but these light sources are not very tunable, typically require large and powerful pump lasers to operate, and are expensive to manufacture. These drawbacks are all showstoppers when it comes to allowing frequency comb enabled precision measurement and spectroscopy to leave the lab. We have demonstrated a new, extremely cheap, simple, and low power laser diode-based frequency comb which is roughly the size of a grain of rice. This laser can be battery powered, and its spectrum is highly controllable, making it an ideal light source to allow advanced precision measurement and spectroscopy to leave the lab. In my talk, I will give a brief overview of frequency comb-based measurements, demonstrate the stability and tunability of our new sources, and outline their prospect for future ground- and space-based applications.

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Conference / Symposium Mon, 19 Aug 2019 08:51:15 -0400 2019-08-22T12:00:00-04:00 2019-08-22T13:00:00-04:00 West Hall Department Colloquia Conference / Symposium West Hall
CM Theory Seminar | Gate-Accessible Superconductivity and Helical Modes in Monolayer WTe_2 (September 5, 2019 4:00pm) https://events.umich.edu/event/65277 65277-16565496@events.umich.edu Event Begins: Thursday, September 5, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

Quantum materials research aims to uncover exotic physics and new approaches toward applied technologies. Two-dimensional crystals consisting of individual layers of van der Waals materials provide an exciting platform to study correlated and topological electronic states. These same crystals can be flexibly restacked into van der Waals heterostructures, which enable clean interfaces between heterogeneous materials. Such heterostructures enable the isolation and protection of air sensitive 2D materials as well as provide new degrees of freedom for tailoring electronic structure and interactions. In this talk, I will present experimental work studying electronic transport in monolayer WTe_2. First, un-doped monolayer WTe_2 exhibits behaviors characteristic of a 2D topological insulator, including edge mode transport approaching the quantum of conductance up to nearly 100 Kelvin. Second, we have discovered that the same monolayers display superconductivity at low carrier densities accessible by local field-effect gating through a low-κ dielectric. The concurrence of electrostatically accessible superconductor and topological insulator phases in the same 2D crystal allows us to envision a new model of gate-configurable topological electronic devices.

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Workshop / Seminar Thu, 05 Sep 2019 18:16:13 -0400 2019-09-05T16:00:00-04:00 2019-09-05T17:00:00-04:00 West Hall Department of Physics Workshop / Seminar West Hall
Biophysics Talk Title: TBD (September 6, 2019 12:00pm) https://events.umich.edu/event/64280 64280-16274491@events.umich.edu Event Begins: Friday, September 6, 2019 12:00pm
Location: Chemistry Dow Lab
Organized By: LSA Biophysics

Abstracts: TBD

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Workshop / Seminar Wed, 10 Jul 2019 11:26:22 -0400 2019-09-06T12:00:00-04:00 2019-09-06T13:00:00-04:00 Chemistry Dow Lab LSA Biophysics Workshop / Seminar Chemistry Dow Lab
Quantitative Biology Seminar | Timeseries Analysis of Stochastic Systems with Hidden Components (September 9, 2019 12:00pm) https://events.umich.edu/event/66309 66309-16727886@events.umich.edu Event Begins: Monday, September 9, 2019 12:00pm
Location: West Hall
Organized By: Department of Physics

Despite dramatic advances in experimental techniques, many facets of intracellular dynamics remain hidden, or can be measured only indirectly. In this talk, I will describe two strategies to analyze stochastic timeseries data from biological systems with hidden parts: replacement of multi-step process with a time delay distribution or quasi-steady-state. Then, I will illustrate how these strategies are applied to understand the processes of protein synthesis, which involves multiple steps such as transcription, translation, folding and maturation, but typically whose intermediates proteins cannot be measured. Furthermore, drugs are also cleared out from our body in multiple steps of metabolism. To estimate the rate of drug clearance, which is a critical factor determining the dose level, a canonical approach has been used in more than 65,000 published papers for last 30 years. I will point out the critical limitation of the canonical approach and propose an alternative approach, which leads to accurate and precise estimation of drug clearance rate.

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Workshop / Seminar Mon, 09 Sep 2019 18:16:27 -0400 2019-09-09T12:00:00-04:00 2019-09-09T13:00:00-04:00 West Hall Department of Physics Workshop / Seminar West Hall
HEP-Astro Seminar | Intergalactic Medium-based Cosmology: from BOSS to DESI (September 9, 2019 4:00pm) https://events.umich.edu/event/64645 64645-16404981@events.umich.edu Event Begins: Monday, September 9, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

Intergalactic Medium (IGM)-based cosmology established itself as a solid cosmological probe with the wide success of the SDSS-III Baryon Oscillation Spectroscopic Survey (BOSS). With the Dark Energy Spectroscopic Instrument (DESI) survey starting imminently, we are taking a look at the accomplishments of SDSS-III with regards to IGM-based cosmology and discussing exciting science and new statistical challenges in the era of DESI.

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Workshop / Seminar Mon, 09 Sep 2019 18:16:27 -0400 2019-09-09T16:00:00-04:00 2019-09-09T17:00:00-04:00 West Hall Department of Physics Workshop / Seminar West Hall
RNA innovation Seminar (September 9, 2019 4:00pm) https://events.umich.edu/event/65134 65134-16539445@events.umich.edu Event Begins: Monday, September 9, 2019 4:00pm
Location: Taubman Biomedical Science Research Building
Organized By: Center for RNA Biomedicine

Abstract: RNA regulation permeates neurobiology. Nociceptors are sensory neurons tasked with the detection of pain producing stimuli. Persistent changes in their activity, termed plasticity, benefit survival through injury avoidance. Nociceptors rely on cap-dependent translation to rapidly increase protein synthesis in response to pro-inflammatory signals. Comparatively little is known regarding the role of the regulatory factors bound to the 3' end of mRNA in nociceptor sensitization. Poly(A)-binding protein (PABP) stimulates translation initiation by bridging the Poly(A) tail to the eukaryotic initiation factor 4F complex associated with the mRNA cap. We have developed an RNA-based competitive inhibitor of PABP that attenuates behavioral responses to pain in mice. To identify the Poly(A) mRNAs subject to privileged translation in response to noxious cues, we have applied ribosome profiling to primary sensory neurons and tissues. A small number of transcripts are selectively translated in response to plasticity mediators. Among them is the capsid forming protein Arc. Arc has been implicated in synaptic plasticity and learning in the brain. We demonstrate that the ribosomal S6 kinase 1 is responsible for Arc production in nociceptors and describe a new role for local translation of Arc in afferent fibers. Collectively, our findings uncover mechanisms and targets of RNA control in sensory neurons that can be exploited to disrupt pain signaling.

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Lecture / Discussion Tue, 20 Aug 2019 15:48:42 -0400 2019-09-09T16:00:00-04:00 2019-09-09T17:00:00-04:00 Taubman Biomedical Science Research Building Center for RNA Biomedicine Lecture / Discussion flyer
HET Brown Bag | Light thermal relic Dark Matter (September 11, 2019 12:00pm) https://events.umich.edu/event/66174 66174-16717506@events.umich.edu Event Begins: Wednesday, September 11, 2019 12:00pm
Location: Randall Laboratory
Organized By: Leinweber Center for Theoretical Physics

The leading candidate for dark matter that is thermally produced in the early Universe is the Weakly Interacting Massive Particle (WIMP). However, increasingly stringent bounds on WIMPs are now motivating the exploration of viable alternatives. One interesting possibility are DM candidates with sub-GeV masses. In this talk, I will present two such examples. First, I will focus on models where the dark matter abundance is set by mutual annihilations among multiple species. I will show how sizable mass splittings between the dark matter states naturally point to masses exponentially lighter than the weak scale. Light dark matter from coannihilation evades stringent bounds from the cosmic microwave background, but will be tested by future direct detection, fixed target, and long-lived particle experiments. Second, I will illustrate another viable thermal dark matter candidate with sub-GeV masses which has been overlooked in the literature: a cosmologically stable dark Higgs.

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Lecture / Discussion Wed, 18 Sep 2019 11:26:47 -0400 2019-09-11T12:00:00-04:00 2019-09-11T13:00:00-04:00 Randall Laboratory Leinweber Center for Theoretical Physics Lecture / Discussion Randall Laboratory
Department Colloquium | From Hadrons to Hidden Assumptions: My Recent Work in Quantum Chromodynamics and Foundations of Physics (September 11, 2019 4:00pm) https://events.umich.edu/event/65278 65278-16565497@events.umich.edu Event Begins: Wednesday, September 11, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

Two recently initiated directions in my research will be discussed. I will present the first results from a new program at the LHCb experiment at CERN to study hadronization, i.e. how subnuclear particles called quarks and gluons form strong force bound states in quantum chromodynamics. These studies at LHCb over the upcoming decade will drive ideas about how to investigate various hadronization mechanisms further at the future Electron-Ion Collider, proposed for construction in the U.S. in the 2020s. I will additionally give an overview of a project exploring the foundations of physics that aims to find a set of minimal assumptions from which the known laws of physics can be rederived. Pinpointing the conditions under which the different branches of physics are valid should give a better understanding of them and may in turn provide new insights for future theories.

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Workshop / Seminar Wed, 11 Sep 2019 18:16:31 -0400 2019-09-11T16:00:00-04:00 2019-09-11T17:00:00-04:00 West Hall Department of Physics Workshop / Seminar West Hall
Growth and Grit: Developing a Mindset for Success (September 11, 2019 5:30pm) https://events.umich.edu/event/65979 65979-16678382@events.umich.edu Event Begins: Wednesday, September 11, 2019 5:30pm
Location: Angell Hall
Organized By: Science Learning Center

What if your ability to succeed in your classes was determined in part before you even stepped into the classroom? What is the one quality you need to overcome adversity academically and in life? This workshop will detail the research of Dr. Carol Dweck and her groundbreaking work on the concept of mindset. Students will learn how to abandon a debilitating fixed mindset in favor of a growth mindset, leading to success in areas they once considered too difficult. The workshop will also introduce students to the research of Dr. Angela Duckworth, and how a growth mindset can lead to the development of grit, an essential characteristic to overcoming our fear of failure.

Registration Link: http://ttc.iss.lsa.umich.edu/undergrad/sessions/growth-and-grit-developing-a-mindset-for-success-science-success-series/

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Workshop / Seminar Thu, 09 Jan 2020 13:40:53 -0500 2019-09-11T17:30:00-04:00 2019-09-11T19:00:00-04:00 Angell Hall Science Learning Center Workshop / Seminar
CM Theory Seminar | Topological and Fractional Electronic States in Graphene Heterostructures (September 12, 2019 4:00pm) https://events.umich.edu/event/66185 66185-16719558@events.umich.edu Event Begins: Thursday, September 12, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

Graphene is a highly tunable platform for studying the effects of electron-electron interactions in two dimensions. Encapsulation with a 2D dielectric (hexagonal boron nitride, hBN), and more recently the use of single-crystal graphite top and bottom gates have decreased the electronic disorder to a level suitable for the to study fragile and exotic strongly correlated states. Additionally, control of twist angle between closely-matched crystal lattices allows for unique control of electronic properties, leading to the “Hofstadter butterfly” and more recently unconventional superconductivity. I will describe newly discovered exotic fractional quantum Hall states and a class of related states called fractional Chern insulators, both in high quality graphene heterostructures. These measurements show that graphene is an intriguing platform for realizing new topological and fractional phases, and opens new routes towards realizing interesting quantum phase transitions and manipulating non-abelian quasiparticles for quantum computation.

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Workshop / Seminar Thu, 12 Sep 2019 18:16:34 -0400 2019-09-12T16:00:00-04:00 2019-09-12T17:00:00-04:00 West Hall Department of Physics Workshop / Seminar West Hall
Biophysics Krimm Lecture - Talk Title: Shining light onto the dark matter of biology: Ion flux modulation and the perplexing resilience of bacteria (September 13, 2019 12:00pm) https://events.umich.edu/event/64266 64266-16274470@events.umich.edu Event Begins: Friday, September 13, 2019 12:00pm
Location: Rackham Graduate School (Horace H.)
Organized By: LSA Biophysics

Abstract: TBD

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Workshop / Seminar Wed, 04 Sep 2019 14:42:01 -0400 2019-09-13T12:00:00-04:00 2019-09-13T13:30:00-04:00 Rackham Graduate School (Horace H.) LSA Biophysics Workshop / Seminar Rackham Graduate School (Horace H.)
HET Seminar | Aspects of five-dimensional superconformal field theories (September 13, 2019 3:00pm) https://events.umich.edu/event/66678 66678-16770193@events.umich.edu Event Begins: Friday, September 13, 2019 3:00pm
Location: West Hall
Organized By: Leinweber Center for Theoretical Physics

Five-dimensional superconformal field theories (5d SCFTs) play an interesting role in the general understanding of quantum field theory. They often provide strongly-coupled UV fixed points with remarkable features for perturbatively non-renormalizable gauge theories, which makes them interesting in their own right. Moreover, prominent lower-dimensional theories can be obtained by compactification from five-dimensional parent theories, and this perspective has led to numerous new insights. A fruitful interplay between string theory and quantum field theory methods has led to a coherent and thorough understanding of 5d SCFTs, and I will review recent developments in this context.

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Lecture / Discussion Thu, 12 Sep 2019 14:54:53 -0400 2019-09-13T15:00:00-04:00 2019-09-13T16:00:00-04:00 West Hall Leinweber Center for Theoretical Physics Lecture / Discussion West Hall
The History of Physics in 13 Songs, From Galileo to Dark Matter (September 13, 2019 8:00pm) https://events.umich.edu/event/65069 65069-16509336@events.umich.edu Event Begins: Friday, September 13, 2019 8:00pm
Location: East Quadrangle
Organized By: Residential College

Join us for a 45-minute interdisciplinary musical performance that highlights the turning points in the history of physics.

The show combines fragments (excerpts from writings by some of the most prominent physicists in history) read and interpreted by a narrator (a role played by Lynnae Lehfeldt in the premiere), with original songs, based on each fragment, composed by Alberto Rojo, and performed by Alberto Rojo (guitar and voice), Michael Gould (percussion), and Dave Haughey (cello). The project explores the intersection between the arts and the sciences, and postulates that art and science are not antagonistic alternatives in the search for truth; rather, there is a broad territory of coexistence.

The movements are as follows Galileo (The Book of the Universe); Isaac Newton (From the Principia); Pierre Maupertuis (Least Action); Rudolf Clausius (The Limiting Condition); Ludwig Boltzmann (Atomic movements); James Clerk Maxwell (From letters to Faraday); Marie Curie (Radioactivity); Albert Einstein (From the 1905 paper); Max Planck (The quantum of action); Werner Heisenberg (Analogies); J. S. Bell (Remote Instruments); Richard Feynman (Trees are made of air); Vera Rubin (Dark Matter)

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Performance Mon, 09 Sep 2019 15:24:23 -0400 2019-09-13T20:00:00-04:00 2019-09-13T21:30:00-04:00 East Quadrangle Residential College Performance Rojo and Gould playing instruments
HEP-Astro Seminar | A Deep Learning Approach to Galaxy Cluster X-ray Masses (September 16, 2019 4:00pm) https://events.umich.edu/event/64708 64708-16428919@events.umich.edu Event Begins: Monday, September 16, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

I will present a machine-learning approach for estimating galaxy cluster masses from Chandra x-ray mock observations. I will describe how a Convolutional Neural Network (CNN) -- a deep machine learning tool commonly used in image recognition tasks -- can be used to infer cluster masses from these images, reducing scatter in the mass estimates by up to 50%. I will also show an interpretation tool, inspired by Google DeepDream, that can be used to gain some physical insight into what the CNN sees.

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Workshop / Seminar Mon, 16 Sep 2019 18:16:47 -0400 2019-09-16T16:00:00-04:00 2019-09-16T17:00:00-04:00 West Hall Department of Physics Workshop / Seminar West Hall
Design principles for organization and self-assembly far from equilibrium (September 17, 2019 11:30am) https://events.umich.edu/event/66305 66305-16727932@events.umich.edu Event Begins: Tuesday, September 17, 2019 11:30am
Location: Weiser Hall
Organized By: The Center for the Study of Complex Systems

Non-equilibrium thermodynamics provides a useful set of tools to analyze and constrain the behavior of far from equilibrium systems. However, these tools have not yet been broadly applied to aid in the control of many body systems and materials assembled far from equilibrium. In this talk, I will report an application of ideas from non-equilibrium thermodynamics to the problems related to morphological changes in membranes, non-equilibrium self-assembly and more broadly control of material properties far from equilibrium. In many of these contexts, I will show how the material properties can be substantially constrained (and even predicted) using tools from non-equilibrium thermodynamics.

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Workshop / Seminar Mon, 09 Sep 2019 10:34:54 -0400 2019-09-17T11:30:00-04:00 2019-09-17T13:00:00-04:00 Weiser Hall The Center for the Study of Complex Systems Workshop / Seminar S. Vaikuntanathan
Understanding the Quantum World and Beyond (September 17, 2019 1:00pm) https://events.umich.edu/event/64667 64667-16420899@events.umich.edu Event Begins: Tuesday, September 17, 2019 1:00pm
Location: Off Campus Location
Organized By: Osher Lifelong Learning Institute (50+)

We’ll read Lee Smolin’s new book, "Einstein’s Unfinished Revolution". To get us up to speed, we’ll also watch the first six DVD lectures of Understanding the Quantum World from the Teaching Company, and we’ll pull in other lectures as needed. The goal is to understand what is missing from quantum mechanics as it currently stands and to see where changes are most likely to come from.
Richard Chase, the study group leader, worked 27 years as a research physicist for Ford and taught physics at several levels. At OLLI, he has taught 15 physics-related classes and led 5 book discussion groups. This Study Group is for those 50 and over and meets Tuesdays, 1:00–3:00 pm on September 17 – December 10 (no class on November 26).

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Class / Instruction Sun, 28 Jul 2019 15:18:11 -0400 2019-09-17T13:00:00-04:00 2019-09-17T15:00:00-04:00 Off Campus Location Osher Lifelong Learning Institute (50+) Class / Instruction Study Group
CM-AMO Seminar | Controlling Light Matter Interactions in Layered Materials with Conventional and Topological Band Structures (September 17, 2019 4:00pm) https://events.umich.edu/event/66791 66791-16778979@events.umich.edu Event Begins: Tuesday, September 17, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

Strongly confined electrical, optical and thermal excitations drastically modify material's properties and break local symmetries that can enable precisely tunable responses and new functionalities. We will discuss the effect of engineered plasmonic lattice on light matter interactions in 2D excitonic crystals to produce novel responses such as enhanced and tunable emission, Fano resonances and strong exciton-plasmon polaritons, which can be precisely controlled by geometry and applied fields to produce new device concepts. Our recent work on collective polaritonic modes and the formation of a complete polaritonic bandgap in few-layered excitonic semiconductors coupled to plasmons will also be presented along with our ability to control them via externally applied electric fields.

We will also discuss our efforts to explore the optoelectronic properties of Mo_x W_{1-x} Te_2, which are type-II Weyl semimetals, i.e., gapless topological states of matter with broken inversion and/or time reversal symmetry, which exhibit unconventional responses to externally applied fields. We have observed spatially dispersive circular photogalvanic effect (s-CPGE) over a wide spectral region (0.2 - 2.0 eV range) in these materials. This effect shows exclusively in the Weyl phase and vanishes upon temperature induced topological phase change. Since the photon energy leads to interband transitions between different electronic bands, we use the density matrix formalism to describe the photocurrent response under chiral optical excitation with a spatially inhomogeneous beam. We will discuss how spatially inhomogeneous optical excitation and unique symmetry and band structure of Weyl semimetals produces CPGE in these systems. The effect of band inversion, Berry curvature and asymmetric carrier relaxation in this material system on the s-CPGE signal will also be discussed along with the implications for designing new and unconventional optoelectronic devices.

Short Biography:
Ritesh Agarwal is a Professor in the Department of Materials Science and Engineering at the University of Pennsylvania. He earned his undergraduate degree from the Indian Institute of Technology, Kanpur in 1996, and a master’s degree from the University of Chicago. He received his PhD in physical chemistry from University of California at Berkeley in 2001 researching liquid and protein solvation and photosynthesis via nonlinear optical techniques. After completing his PhD., Ritesh was a postdoctoral fellow at Harvard where he studied the photonic properties of semiconductor nanowires. His current research interests include structural, chemical, optical and electronic properties of low-dimensional systems. Ritesh is the recipient of the NSF CAREER award in 2007, NIH Director’s New Innovator Award in 2010 and the SPIE Nanoengineering Pioneer Award in 2014. In 2017 he became the director of a Multi-University Research Initiative on Phase Change Materials for Photonics, leading a team of six PIs from five universities.

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Workshop / Seminar Tue, 17 Sep 2019 18:17:16 -0400 2019-09-17T16:00:00-04:00 2019-09-17T17:00:00-04:00 West Hall Department of Physics Workshop / Seminar West Hall
HET Brown Bag Seminars | Wilson line dressings as carriers of asymptotic symmetry charges (September 18, 2019 12:00pm) https://events.umich.edu/event/67044 67044-16796475@events.umich.edu Event Begins: Wednesday, September 18, 2019 12:00pm
Location: Randall Laboratory
Organized By: Leinweber Center for Theoretical Physics

It is known that for a gauge-invariant formulation of QED and gravity, one should dress particles with Wilson lines stretching out to infinity. When considering asymptotic particles of scattering processes, such dressed particle states reduce to the infrared-finite states of Faddeev and Kulish. In quantum field theories in flat spacetime, the dressings of asymptotic states are known to carry a definite leading soft charge of the asymptotic symmetry, which can be interpreted as soft hair at infinity. Some recent attempts to extend this to subleading order will be briefly mentioned. We explore how this analysis can be extended to curved spacetimes with boundary, in particular, the Rindler and Schwarzschild spacetimes. More specifically, we will show that infalling dressed matter on the future Rindler and Schwarzschild horizons implant soft horizon hair.

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Lecture / Discussion Thu, 12 Sep 2019 15:28:20 -0400 2019-09-18T12:00:00-04:00 2019-09-18T13:00:00-04:00 Randall Laboratory Leinweber Center for Theoretical Physics Lecture / Discussion Randall Laboratory
Department Colloquium (September 18, 2019 4:00pm) https://events.umich.edu/event/67172 67172-16805254@events.umich.edu Event Begins: Wednesday, September 18, 2019 4:00pm
Location: West Hall
Organized By: Undergrad Physics Events

Department Colloquium

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Workshop / Seminar Fri, 13 Sep 2019 16:21:49 -0400 2019-09-18T16:00:00-04:00 2019-09-18T17:00:00-04:00 West Hall Undergrad Physics Events Workshop / Seminar West Hall
Department Colloquium | Advancing CMB Cosmology: ACTPol, Simons Observatory, and CMB-S4 (September 18, 2019 4:00pm) https://events.umich.edu/event/65279 65279-16565498@events.umich.edu Event Begins: Wednesday, September 18, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

Measurements of the cosmic microwave background (CMB) are a powerful probe of the origin, contents, and evolution of our Universe. CMB measurements continue to improve according to a Moore’s law under which the mapping speed of experiments improves by an order of magnitude roughly every five years. This rapid progression in our ability to measure the CMB has translated into a series of scientific advances including showing our universe to be spatially flat, constraining inflationary and alternative theories of the primordial universe, and providing a cornerstone for our precision knowledge of the Lambda-CDM model. Observations with the current generation of experiments, including Advanced ACTPol, will soon produce improved cosmological constraints. Building on this work, in the coming decade Simons Observatory and ultimately CMB-S4 will: pass critical thresholds in constraints on inflation and light relativistic species; provide improved measurements of dark energy, dark matter, neutrino masses, and a variety of astrophysical phenomena; and enable searches for new surprises.

In this talk I present the design and status of measurements with Advanced ACTPol and how we are building on this work to realize the next generations of experiments including Simons Observatory and CMB-S4. I will highlight the technological advances that underlie the rapid progress in measurements including: polarization sensitive detectors which simultaneously observe in multiple colors; metamaterial antireflection coated lenses and polarization modulators; and overall advances in experimental design. I will present preliminary new results from ACTPol and conclude with science forecasts for the coming decade.

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Workshop / Seminar Wed, 18 Sep 2019 18:17:13 -0400 2019-09-18T16:00:00-04:00 2019-09-18T17:00:00-04:00 West Hall Department of Physics Workshop / Seminar West Hall
Make It Stick: Research-Based Learning Strategies You Need to Know (September 18, 2019 5:30pm) https://events.umich.edu/event/65980 65980-16678383@events.umich.edu Event Begins: Wednesday, September 18, 2019 5:30pm
Location: Angell Hall
Organized By: Science Learning Center

The study and learning strategies students often bring to college are often insufficient to help them succeed at the university level. Particularly in challenging STEM courses, students can't simply memorize or cram their way to a good grade. This workshop will focus on the popular learning strategies to avoid, as well as the top three strategies you don't know but are shown by research to be the most effective for long-term learning.

Registration Link: http://ttc.iss.lsa.umich.edu/undergrad/sessions/make-it-stick-research-based-learning-strategies-you-need-to-know-science-success-series/

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Workshop / Seminar Wed, 04 Sep 2019 15:39:54 -0400 2019-09-18T17:30:00-04:00 2019-09-18T19:00:00-04:00 Angell Hall Science Learning Center Workshop / Seminar
CM Theory Seminar | Fracton Phase of Matter: From Fantasy to Reality (September 19, 2019 4:00pm) https://events.umich.edu/event/65861 65861-16662139@events.umich.edu Event Begins: Thursday, September 19, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

Fracton phase of matter shares many features of topological order, including long-range entangled ground states and non-trivial braiding statistics. At the same time, fracton phase contains subextensive ground-state degeneracy and the restricted mobility of quasiparticle which exclude itself from the TQFT paradigm. In this talk, I will present a theoretical framework on higher rank Chern-Simons theory in 3D as the low energy effective theory for Fracton phases. In addition, I will mention the emergent fractonic phenomenon in plaquette paramagnetic crystal which prompts an algebraic quantum liquid phase with a 'bose Fermi surface'.

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Workshop / Seminar Thu, 19 Sep 2019 18:17:13 -0400 2019-09-19T16:00:00-04:00 2019-09-19T17:00:00-04:00 West Hall Department of Physics Workshop / Seminar West Hall
Biophysics Talk Title: "Emerging methods in solution NMR and applications to illuminate blind spots in human biology” (September 20, 2019 12:00pm) https://events.umich.edu/event/64267 64267-16274479@events.umich.edu Event Begins: Friday, September 20, 2019 12:00pm
Location: Chemistry Dow Lab
Organized By: LSA Biophysics

Abstract: TBD

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Workshop / Seminar Wed, 04 Sep 2019 14:42:29 -0400 2019-09-20T12:00:00-04:00 2019-09-20T13:00:00-04:00 Chemistry Dow Lab LSA Biophysics Workshop / Seminar Chemistry Dow Lab
HET Seminar | The Future Frontier of Higgs Physics (September 20, 2019 3:00pm) https://events.umich.edu/event/67023 67023-16796448@events.umich.edu Event Begins: Friday, September 20, 2019 3:00pm
Location: West Hall
Organized By: Leinweber Center for Theoretical Physics

I will summarize what we don't already know about the 125 GeV Higgs boson and discuss directions for future investigation.

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Lecture / Discussion Thu, 12 Sep 2019 12:29:25 -0400 2019-09-20T15:00:00-04:00 2019-09-20T16:00:00-04:00 West Hall Leinweber Center for Theoretical Physics Lecture / Discussion West Hall
Dr. Kevin Wood Tenure Talk (September 20, 2019 4:00pm) https://events.umich.edu/event/67138 67138-16805204@events.umich.edu Event Begins: Friday, September 20, 2019 4:00pm
Location: Chemistry Dow Lab
Organized By: LSA Biophysics

Abstract: TBD

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Workshop / Seminar Fri, 13 Sep 2019 12:28:49 -0400 2019-09-20T16:00:00-04:00 2019-09-20T17:30:00-04:00 Chemistry Dow Lab LSA Biophysics Workshop / Seminar Chemistry Dow Lab
Gateway NMR Meeting (September 21, 2019 8:00am) https://events.umich.edu/event/64651 64651-16404987@events.umich.edu Event Begins: Saturday, September 21, 2019 8:00am
Location: Chemistry Dow Lab
Organized By: LSA Biophysics

Registration: https://sites.google.com/umich.edu/gatewaynmr2019/home

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Meeting Fri, 26 Jul 2019 15:01:32 -0400 2019-09-21T08:00:00-04:00 2019-09-21T17:00:00-04:00 Chemistry Dow Lab LSA Biophysics Meeting Chemistry Dow Lab
Gateway NMR Meeting (September 22, 2019 8:00am) https://events.umich.edu/event/64651 64651-16404988@events.umich.edu Event Begins: Sunday, September 22, 2019 8:00am
Location: Chemistry Dow Lab
Organized By: LSA Biophysics

Registration: https://sites.google.com/umich.edu/gatewaynmr2019/home

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Meeting Fri, 26 Jul 2019 15:01:32 -0400 2019-09-22T08:00:00-04:00 2019-09-22T17:00:00-04:00 Chemistry Dow Lab LSA Biophysics Meeting Chemistry Dow Lab
Special AMO Seminar | Quantum Optics with Molecules (September 23, 2019 12:00pm) https://events.umich.edu/event/66867 66867-16781211@events.umich.edu Event Begins: Monday, September 23, 2019 12:00pm
Location: West Hall
Organized By: Department of Physics

Recent experimental progress in the collective strong coupling regime of organic molecules with optical cavity or plasmonic modes has shown light-induced modifications of material properties. Experimental and theoretical endeavors go in the direction of charge and energy transport, Förster resonance energy transfer (FRET) enhancement, modified chemical reactivity etc. Oftentimes experiments rely on theoretical models developed for standard cavity quantum electrodynamics with two-level quantum emitters. Molecular systems however have an increased complexity as molecular vibrations and level disorder play a crucial role. We provide a theoretical formalism to tackle the light-electronic-vibrations dynamics modeled via the Holstein-Tavis-Cummings Hamiltonian [1]. We analytically describe aspects such as: polariton asymmetry, molecular branching ratio modification in the Purcell regime and cavity-mediated donor-acceptor FRET processes.

[1] M. Reitz, C. Sommer and C. Genes, Langevin approach to quantum optics with molecules, Phys. Rev. Letts 122, 203602 (2019)

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Workshop / Seminar Mon, 23 Sep 2019 18:17:04 -0400 2019-09-23T12:00:00-04:00 2019-09-23T13:00:00-04:00 West Hall Department of Physics Workshop / Seminar West Hall
HEP-Astro Seminar | Doping Xenon - Performance Enhanced Dark Matter Detectors (September 23, 2019 4:00pm) https://events.umich.edu/event/65417 65417-16597551@events.umich.edu Event Begins: Monday, September 23, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

After a series of null results from the LHC and large direct detection experiments, dark matter remains frustratingly mysterious, and much of the canonical heavy WIMP parameter space is now ruled out. In this talk, I will summarize the current state of the field of dark matter direct detection, and discuss an idea to expand the parameter space that can be probed by large liquid xenon TPCs like the LUX-ZEPLIN (LZ) detector by a adding hydrogen to the target, opening up sensitivity to WIMP masses well below 1 GeV.

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Workshop / Seminar Mon, 23 Sep 2019 18:17:04 -0400 2019-09-23T16:00:00-04:00 2019-09-23T17:00:00-04:00 West Hall Department of Physics Workshop / Seminar West Hall
Complex Systems Seminar | Statistical Mechanics of Microbiomes (September 24, 2019 11:30am) https://events.umich.edu/event/63981 63981-16051364@events.umich.edu Event Begins: Tuesday, September 24, 2019 11:30am
Location: Weiser Hall
Organized By: The Center for the Study of Complex Systems

Abstract: Next-generation sequencing, high-throughput metabolomics and other measurement technologies have opened vast new horizons for collecting data on the structure and function of microbial communities. But it remains unclear how to leverage this data for effective intervention in medical and agricultural applications. We do not know which quantities can be reliably predicted, which are hopelessly contingent, and what the predictors are for the former. In this talk, I will draw on conceptual tools from Statistical Physics, which were designed to answer precisely these sorts of questions. In particular, I will argue that the key features of community structure are encoded in a susceptibility matrix, which contain the response of species population sizes to small changes in growth rates. I will show how to estimate this matrix in different scenarios from existing data sets, and then explain how it can be used to cluster species into functionally redundant groups for enhanced predictability of community composition.

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Workshop / Seminar Wed, 18 Sep 2019 15:55:41 -0400 2019-09-24T11:30:00-04:00 2019-09-24T13:00:00-04:00 Weiser Hall The Center for the Study of Complex Systems Workshop / Seminar Robert Marsland Photo
CM-AMO Seminar | From Floquet Real to Imaginary Time Crystal (September 24, 2019 4:00pm) https://events.umich.edu/event/64762 64762-16444919@events.umich.edu Event Begins: Tuesday, September 24, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

Quantum time crystal has been an intriguing many-body “time” state that has received much attention and debate since its early prediction. In this talk, first, I will construct a class of concrete “clean” Floquet models to answer the open question on the role of disorder and many-body localization. Second, by observing the equivalent role of the space and imaginary time in the path integral formalism, I will present the finding that hard-core bosons coupled to a thermal bath may exhibit the order of “imaginary spacetime crystal”.

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Workshop / Seminar Tue, 24 Sep 2019 18:17:03 -0400 2019-09-24T16:00:00-04:00 2019-09-24T17:00:00-04:00 West Hall Department of Physics Workshop / Seminar West Hall
HET Brown Bag Seminars | Improving Numerical Integration and Event Generation with Normalizing Flows (September 25, 2019 12:00pm) https://events.umich.edu/event/67322 67322-16837722@events.umich.edu Event Begins: Wednesday, September 25, 2019 12:00pm
Location: Randall Laboratory
Organized By: Leinweber Center for Theoretical Physics

With the upcoming HL-LHC, the budget for computing will be insufficient to generate a sufficient amount of Monte-Carlo events for both signal and background predictions. The driving force behind these costs is the inefficiency of the Monte-Carlo phase space generators and the unweighting efficiencies.
After a short review of traditional algorithms, I will introduce a new Machine Learning algorithm that uses Normalizing Flows for efficient numerical integration and random sampling. This approach is especially efficient in high-dimensional integration spaces. I will show some preliminary results obtained with the matrix element generator of Sherpa and discuss different choices of hyperparameters and their influence on the result.

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Lecture / Discussion Wed, 25 Sep 2019 14:36:53 -0400 2019-09-25T12:00:00-04:00 2019-09-25T13:00:00-04:00 Randall Laboratory Leinweber Center for Theoretical Physics Lecture / Discussion Randall Laboratory
DCMB Seminar, "Bioinformatics in Drug Discovery" (September 25, 2019 2:30pm) https://events.umich.edu/event/66407 66407-16734206@events.umich.edu Event Begins: Wednesday, September 25, 2019 2:30pm
Location: Taubman Biomedical Science Research Building
Organized By: DCMB Seminar Series

Abstract:
She’ll be describing the technologies and datasets her team uses to study human disease and develop new and improved treatments for their clients. She’ll cover the applications of traditional transcriptional profiling and sequence analysis as well as datasets and tools developed specifically for therapeutics development including CMap, Project Achilles, PRISM, functional CRISPR screening and others. She’ll also touch on topics like biomarker development, patient selection/stratification and gene therapy development. Along the way, she’ll describe what it’s like to work as a consultant, and how it differs from academic work or direct employment in the pharmaceutical industry.

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Lecture / Discussion Thu, 05 Sep 2019 11:01:32 -0400 2019-09-25T14:30:00-04:00 2019-09-25T15:30:00-04:00 Taubman Biomedical Science Research Building DCMB Seminar Series Lecture / Discussion
Department Colloquium (September 25, 2019 4:00pm) https://events.umich.edu/event/67173 67173-16805255@events.umich.edu Event Begins: Wednesday, September 25, 2019 4:00pm
Location: West Hall
Organized By: Undergrad Physics Events

Department Colloquium

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Workshop / Seminar Fri, 13 Sep 2019 16:25:04 -0400 2019-09-25T16:00:00-04:00 2019-09-25T17:00:00-04:00 West Hall Undergrad Physics Events Workshop / Seminar West Hall
Department Colloquium | New Realms in Coherent Light-Matter Interactions (September 25, 2019 4:00pm) https://events.umich.edu/event/65280 65280-16565499@events.umich.edu Event Begins: Wednesday, September 25, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

Light-matter interactions are at the heart of quantum electrodynamics and underpin modern photonic technologies. As we develop means to control the properties of light, matter and their interactions, intriguing new phenomena emerge. Using a designer polariton platform we have developed, we reveal a long sought after Bardeen-Cooper-Schrieffer like phase in a particle-hole-photon strongly-coupled system. Coupling two trapped polariton condensates through both coherent tunneling and incoherent dissipation, we form a model system of rich nonlinear dynamics where new, equidistant frequency lines emerge via the limit cycles at Hopft bifurcation. Using two-dimensional monolayer crystals with exceptionally strong light-matter interactions, we control the exciton-photon interactions from the incoherent limit to the coherent limit with simple mirrors and laser pulses, showing the promise of the system for photonic applications based on coherent light-matter interactions. Combining different monolayers to form atomically-thin heterostructures, we obtain a platform that allows versatile control over both the photon modes and matter excitations, where we create long-lived valley excitons, ultra-thin lasers, and moire-lattice induced hybrid dipolar excitons and polaritons.

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Workshop / Seminar Wed, 25 Sep 2019 18:17:20 -0400 2019-09-25T16:00:00-04:00 2019-09-25T17:00:00-04:00 West Hall Department of Physics Workshop / Seminar West Hall
CJS Noon Lecture Series | Working on a High Energy Experiment in Japan (September 26, 2019 12:00pm) https://events.umich.edu/event/65578 65578-16619774@events.umich.edu Event Begins: Thursday, September 26, 2019 12:00pm
Location: Weiser Hall
Organized By: Center for Japanese Studies

During the last twelve years I have been working on a High Energy Experiment (HEP) in Tokai, Japan. In this lecture I will summarize the significant accomplishments Japanese physicists have made in this field. I will describe the current HEP program in Japan, and then talk about the experiment I have been working on.

I was a graduate student at Yale University and worked on an experiment at Brookhaven National Laboratory. I was a postdoc at the University of Chicago before moving to Michigan in 1989. I have worked on experiments at Fermilab near Chicago, CERN in Switzerland, and JPARC in Japan. I was Chair of the Physics Department and Associate Dean for the Natural Sciences.

If you are a person with a disability who requires an accommodation to attend this event, please reach out to us at least 2 weeks in advance of this event. Please be aware that advance notice is necessary as some accommodations may require more time for the university to arrange.

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Lecture / Discussion Thu, 22 Aug 2019 09:29:41 -0400 2019-09-26T12:00:00-04:00 2019-09-26T13:30:00-04:00 Weiser Hall Center for Japanese Studies Lecture / Discussion Myron Campbell, Professor of Physics, University of Michigan
Biophysics Talk Title: "Mapping the Ligand Binding Landscape" (September 27, 2019 12:00pm) https://events.umich.edu/event/64270 64270-16274480@events.umich.edu Event Begins: Friday, September 27, 2019 12:00pm
Location: Chemistry Dow Lab
Organized By: LSA Biophysics

Abstract: TBD

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Workshop / Seminar Wed, 04 Sep 2019 14:43:16 -0400 2019-09-27T12:00:00-04:00 2019-09-27T13:00:00-04:00 Chemistry Dow Lab LSA Biophysics Workshop / Seminar Chemistry Dow Lab
Life In Graduate School | Computational Resources at Michigan (September 27, 2019 12:00pm) https://events.umich.edu/event/67234 67234-16828994@events.umich.edu Event Begins: Friday, September 27, 2019 12:00pm
Location: West Hall
Organized By: Life in Graduate School Seminars

Computational Resources at Michigan

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Workshop / Seminar Mon, 16 Sep 2019 09:21:06 -0400 2019-09-27T12:00:00-04:00 2019-09-27T13:00:00-04:00 West Hall Life in Graduate School Seminars Workshop / Seminar West Hall
HET Seminar | Extremal Correlators (September 27, 2019 3:00pm) https://events.umich.edu/event/67551 67551-16892236@events.umich.edu Event Begins: Friday, September 27, 2019 3:00pm
Location: West Hall
Organized By: Leinweber Center for Theoretical Physics

I will review some of the properties of extremal correlators. I will then describe the large charge limit of some N=2 theories in four dimensions. I will derive a dual random matrix description which admits a ’t Hooft expansion, which is dual to the double scaling limit of the gauge theory. I will compute the analytic and non-analytic terms in the ’t Hooft coupling and give some physical interpretation of the results.

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Lecture / Discussion Mon, 23 Sep 2019 13:31:06 -0400 2019-09-27T15:00:00-04:00 2019-09-27T16:00:00-04:00 West Hall Leinweber Center for Theoretical Physics Lecture / Discussion West Hall
HEP-Astro Seminar | Status of Belle II (September 30, 2019 4:00pm) https://events.umich.edu/event/66186 66186-16719559@events.umich.edu Event Begins: Monday, September 30, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

Belle II and SuperKEKB are the upgrades to the very successful Belle and KEKB B-factory. The goal of this new effort is to increase the data set by a factor of 50 enabling the search for physics beyond the standard model at the intensity frontier. Data taking started in early 2019, and I will describe the new detector and accelerator, give its present status, show some preliminary results, and estimate future prospects.

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Workshop / Seminar Mon, 30 Sep 2019 18:17:18 -0400 2019-09-30T16:00:00-04:00 2019-09-30T17:00:00-04:00 West Hall Department of Physics Workshop / Seminar West Hall
Physics & Astronomy Special Joint Colloquium | Sexual Harassment in STEM: A View from the National Academies (October 1, 2019 3:00pm) https://events.umich.edu/event/66763 66763-16776776@events.umich.edu Event Begins: Tuesday, October 1, 2019 3:00pm
Location: West Hall
Organized By: Department Colloquia

Persistent sexual harassment of women in science has remained a challenge for decades. It jeopardizes progress in closing the gender gap, damages research integrity, and results in a costly loss of talent. In 2016, the National Academies of Sciences, Engineering, and Medicine assembled a committee to conduct a study on this problem. The committee published a comprehensive report in 2018 titled, "Sexual Harassment of Women: Climate, Culture, and Consequences in Academic Sciences, Engineering, and Medicine." The report identifies key findings on the causes and consequences of sexual harassment, and lays out recommendations for institutional policies, strategies, and practices to address and prevent it. U-M Professors Lilia Cortina and Anna Kirkland were two members of that committee. In this talk they will review key findings from the report and discuss implications at the department level.

Please note: Should you require any accommodations to ensure equal access and opportunity related to this event please contact Stacy Tiburzi at 734-764-3440 or stibu@umich.edu.

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Workshop / Seminar Tue, 10 Sep 2019 10:07:37 -0400 2019-10-01T15:00:00-04:00 2019-10-01T16:00:00-04:00 West Hall Department Colloquia Workshop / Seminar West Hall
CM-AMO Seminar | Shedding New Light on Dirac Materials with Nonlinear Optics (October 1, 2019 4:00pm) https://events.umich.edu/event/67592 67592-16900780@events.umich.edu Event Begins: Tuesday, October 1, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

Nonlinear optics has recently emerged as an attractive approach for both probing topological properties and driving Dirac materials into new states. Here, I will describe our use of ultrafast nonlinear optics, especially at terahertz (THz) frequencies, to study three representative Dirac materials: graphene micro-ribbons, topological insulators, and Weyl semimetals. We used THz magneto-optical spectroscopy to examine periodic arrays of graphene micro-ribbons, enabling us to control the transmission and Faraday rotation spectra of THz pulses via coupling to discretized magnetoplasmon modes. In the Weyl semimetal TaAs, time-resolved second harmonic generation enabled us to reveal a new photoinduced phase, and THz emission spectroscopy was used to provide new insight into the circular photogalvanic effect. Finally, we used intense THz pulses to drive and coherently control structural dynamics in the topological insulator Bi2Se3. Overall, our studies demonstrate the utility of nonlinear optics in shedding new light on both static and dynamic properties of topological materials.

Biography: Dr. Rohit P. Prasankumar received a B.S. in Electrical Engineering from the University of Texas at Austin in 1997 and the M.S. and Ph.D. degrees in Electrical Engineering from MIT in 1999 and 2003, respectively. His thesis work, completed in 2003, concentrated on developing novel approaches for self-starting mode-locking in solid state lasers. Dr. Prasankumar subsequently performed his postdoctoral research at Los Alamos National Laboratory (LANL), focusing on ultrafast mid-to-far-infrared dynamics in semiconductor nanostructures and strongly correlated compounds. He has been a technical staff member at the Center for Integrated Nanotechnologies (CINT) at LANL since 2006, with research interests principally directed towards the measurement of dynamics in complex materials, such as multiferroics, semiconductor nanowires, and topological materials, with high temporal and spatial resolution over a broad spectral range. He is also a research associate professor at the University of New Mexico.

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Workshop / Seminar Tue, 01 Oct 2019 18:17:13 -0400 2019-10-01T16:00:00-04:00 2019-10-01T17:00:00-04:00 West Hall Department of Physics Workshop / Seminar West Hall
HET Brown Bag Seminars | Massive Gravitons in Curved Spacetimes (October 2, 2019 12:00pm) https://events.umich.edu/event/67618 67618-16907162@events.umich.edu Event Begins: Wednesday, October 2, 2019 12:00pm
Location: Randall Laboratory
Organized By: Leinweber Center for Theoretical Physics

This talk will cover various interesting topics that occur in massive spin-2 on various spacetimes including de Sitter, anti-de Sitter, and flat space. In de Sitter, we examine what happens to massive gravity as its mass approaches the partially massless value. In this limit, if the interactions are chosen to be precisely those of the 'candidate' non-linear partially massless theory, the strong coupling scale is raised, giving the theory a wider range of applicability. In anti-de Sitter and flat spacetime, we show how shift symmetries acting on the vector modes emerge from massive spin-2 theories fixing the non-linear structure and discuss whether these theories have amplitudes that can be constructed via soft substracted recursion.

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Lecture / Discussion Thu, 03 Oct 2019 10:57:15 -0400 2019-10-02T12:00:00-04:00 2019-10-02T13:00:00-04:00 Randall Laboratory Leinweber Center for Theoretical Physics Lecture / Discussion Randall Laboratory
Department Colloquium | Towards a Better Understanding of the Electroweak Symmetry Breaking Mechanism (October 2, 2019 4:00pm) https://events.umich.edu/event/65281 65281-16565500@events.umich.edu Event Begins: Wednesday, October 2, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

In the Standard Model of particle physics, the massless Goldstone bosons resulting from spontaneous symmetry breaking of the Higgs field became longitudinal components of the W and Z bosons and thus make these vector bosons massive. It is critical to study longitudinal-longitudinal scattering of W and Z bosons at the LHC to validate this electroweak symmetry breaking mechanism and to search for other alternative mechanisms. I will present a few studies that are related to vector boson scattering using data collected by the ATLAS detector. In addition, I will discuss Phase-I and Phase-II upgrade activities of the ATLAS muon spectrometer that my research group has been involved in.

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Workshop / Seminar Wed, 02 Oct 2019 18:17:18 -0400 2019-10-02T16:00:00-04:00 2019-10-02T17:00:00-04:00 West Hall Department of Physics Workshop / Seminar West Hall
Department Colloquium | Towards a Better Understanding of the Electroweak Symmetry Breaking Mechanism (October 2, 2019 4:00pm) https://events.umich.edu/event/67174 67174-16805256@events.umich.edu Event Begins: Wednesday, October 2, 2019 4:00pm
Location: West Hall
Organized By: Undergrad Physics Events

In the Standard Model of particle physics, the massless Goldstone bosons resulting from spontaneous symmetry breaking of the Higgs field became longitudinal components of the W and Z bosons and thus make these vector bosons massive. It is critical to study longitudinal-longitudinal scattering of W and Z bosons at the LHC to validate this electroweak symmetry breaking mechanism and to search for other alternative mechanisms. I will present a few studies that are related to vector boson scattering using data collected by the ATLAS detector. In addition, I will discuss Phase-I and Phase-II upgrade activities of the ATLAS muon spectrometer that my research group has been involved in.

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Workshop / Seminar Fri, 27 Sep 2019 13:57:14 -0400 2019-10-02T16:00:00-04:00 2019-10-02T17:00:00-04:00 West Hall Undergrad Physics Events Workshop / Seminar West Hall
Biophysics Talk Title: TBD (October 4, 2019 12:00pm) https://events.umich.edu/event/64281 64281-16274492@events.umich.edu Event Begins: Friday, October 4, 2019 12:00pm
Location: Chemistry Dow Lab
Organized By: LSA Biophysics

Abstracts: TBD

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Workshop / Seminar Wed, 10 Jul 2019 11:27:51 -0400 2019-10-04T12:00:00-04:00 2019-10-04T13:00:00-04:00 Chemistry Dow Lab LSA Biophysics Workshop / Seminar Chemistry Dow Lab
HEP-Astro Seminar | Exploring QCD with Jet Substructure at the LHC (October 7, 2019 4:00pm) https://events.umich.edu/event/67013 67013-16796440@events.umich.edu Event Begins: Monday, October 7, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

The inner structure of jets is sensitive to QCD across a wide range of scales, from the perturbative parton shower down to non-perturbative hadronization effects. This information has been used in many searches for distinguishing between different types of jets, but it has been challenging to produce theoretical predictions for these substructure observables due to the presence of non-global logarithms. Recent advances in jet grooming algorithms have made it possible to produce calculations beyond leading logarithmic accuracy for jet substructure observables for the first time at a hadron collider. I will discuss the measurement of the Soft Drop jet mass using data from the ATLAS experiment, which was the first measurement of a substructure observable which could be compared to theoretical predictions beyond leading logarithmic accuracy. I will then discuss the implications of this work, including the possibilities for Monte Carlo tuning as well as measurements of Standard Model parameters.

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Workshop / Seminar Mon, 07 Oct 2019 18:17:20 -0400 2019-10-07T16:00:00-04:00 2019-10-07T17:00:00-04:00 West Hall Department of Physics Workshop / Seminar West Hall
CM-AMO Seminar | Quantifying the Impact of State-Mixing on the Rydberg Excitation Blockade (October 8, 2019 4:00pm) https://events.umich.edu/event/67614 67614-16902922@events.umich.edu Event Begins: Tuesday, October 8, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

The Rydberg excitation blockade, a process in which interactions among highly-excited atoms suppress laser excitation, has been at the heart of an impressive array of recent achievements in quantum information and simulation. It has been shown that state-mixing interactions, which result from couplings among multi particle Rydberg states near Förster resonance, may compromise the effectiveness of the blockade under otherwise favorable conditions [1]. We present progress on an experiment in which we seek to quantify the negative impact of state-mixing on the blockade. We use state-selective field ionization spectroscopy to measure, on a shot-by-shot basis, the distribution of Rydberg states populated during narrowband laser excitation of ultracold rubidium atoms. Our method allows us to quantify both the “mixing-free” blockade effectiveness, as well as the number of additional Rydberg excitations added by each mixing event.

[1] A. Reinhard, et al, PRL, 100, 123007 (2008)

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Workshop / Seminar Tue, 08 Oct 2019 18:17:21 -0400 2019-10-08T16:00:00-04:00 2019-10-08T17:00:00-04:00 West Hall Department of Physics Workshop / Seminar West Hall
Medical School Student Panel Discussion (October 8, 2019 6:00pm) https://events.umich.edu/event/65981 65981-16678384@events.umich.edu Event Begins: Tuesday, October 8, 2019 6:00pm
Location: Biological Sciences Building
Organized By: Science Learning Center

Here is your chance to hear about what life is like for several medical school students and residents. Learn about each of their paths to medicine, experiences in medical school, and things they wished they had known in college. You can also submit your own questions ahead of time using the following link: http://tiny.cc/med-student-panel.

Registration Link: http://ttc.iss.lsa.umich.edu/undergrad/sessions/medical-school-student-panel-discussion-2/

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Workshop / Seminar Wed, 04 Sep 2019 15:40:54 -0400 2019-10-08T18:00:00-04:00 2019-10-08T19:00:00-04:00 Biological Sciences Building Science Learning Center Workshop / Seminar Biological Sciences Building
HET Brown Bag Seminars | Dark matter - phonon scattering (October 9, 2019 12:00pm) https://events.umich.edu/event/67843 67843-16960472@events.umich.edu Event Begins: Wednesday, October 9, 2019 12:00pm
Location: Randall Laboratory
Organized By: Leinweber Center for Theoretical Physics

Upcoming sensor technology allows for dark matter direct detection all the way down to the warm dark matter limit of ~ 10 keV. At such low masses, the usual nuclear recoil picture breaks down, as the dark matter recoils against individual athermal phonon modes instead. I will show how the rate for these processes can be calculated and why superfluid helium and polar materials are good targets for this type of dark matter. In the latter case the crystal axis can provide a daily modulation of the scattering rate.

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Lecture / Discussion Thu, 10 Oct 2019 09:39:21 -0400 2019-10-09T12:00:00-04:00 2019-10-09T13:00:00-04:00 Randall Laboratory Leinweber Center for Theoretical Physics Lecture / Discussion Randall Laboratory
Department Colloquium | Engineering Correlation and Topology in Two-Dimensional Moire Superlattices (October 9, 2019 4:00pm) https://events.umich.edu/event/64804 64804-16446948@events.umich.edu Event Begins: Wednesday, October 9, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

Van der Waals heterostructures of atomically thin crystals offer an exciting new platform to design novel electronic and optical properties. In this talk, I will describe how to engineer correlated and topological physics using moire superlattice in two dimensional heterostructures. I will show that we can realize and control extremely rich condensed matter physics, ranging from correlated Mott insulator and superconductivity to ferromagnetism and topological Chern insulator, in a single device featuring the ABC trilayer graphene and boron nitride moire superlattices.

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Workshop / Seminar Wed, 09 Oct 2019 18:17:08 -0400 2019-10-09T16:00:00-04:00 2019-10-09T17:00:00-04:00 West Hall Department of Physics Workshop / Seminar West Hall
Department Colloquium | Engineering Correlation and Topology in Two-Dimensional Moire Superlattices (October 9, 2019 4:00pm) https://events.umich.edu/event/67175 67175-16805257@events.umich.edu Event Begins: Wednesday, October 9, 2019 4:00pm
Location: West Hall
Organized By: Undergrad Physics Events

Van der Waals heterostructures of atomically thin crystals offer an exciting new platform to design novel electronic and optical properties. In this talk, I will describe how to engineer correlated and topological physics using moire superlattice in two dimensional heterostructures. I will show that we can realize and control extremely rich condensed matter physics, ranging from correlated Mott insulator and superconductivity to ferromagnetism and topological Chern insulator, in a single device featuring the ABC trilayer graphene and boron nitride moire superlattices.

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Workshop / Seminar Fri, 27 Sep 2019 13:58:52 -0400 2019-10-09T16:00:00-04:00 2019-10-09T17:00:00-04:00 West Hall Undergrad Physics Events Workshop / Seminar West Hall
CGIS Study Abroad Fair (October 10, 2019 12:00pm) https://events.umich.edu/event/64876 64876-16483057@events.umich.edu Event Begins: Thursday, October 10, 2019 12:00pm
Location: Michigan League
Organized By: Center for Global and Intercultural Study

Learn about 140 programs in over 50 countries, ask about U-M faculty-led programs, and figure out which program can help satisfy your major/minor requirements. CGIS has programs ranging from 3 weeks to an academic year! Meet with CGIS advisors, staff from the Office of Financial Aid and the LSA Scholarship Office, CGIS
Alumni, and other on-campus offices who can help you select a program that works best for you.

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Fair / Festival Thu, 15 Aug 2019 13:41:18 -0400 2019-10-10T12:00:00-04:00 2019-10-10T16:00:00-04:00 Michigan League Center for Global and Intercultural Study Fair / Festival PHOTO
Biophysics Talk Title: TBD (October 11, 2019 12:00pm) https://events.umich.edu/event/64272 64272-16274482@events.umich.edu Event Begins: Friday, October 11, 2019 12:00pm
Location: Chemistry Dow Lab
Organized By: LSA Biophysics

Abstract: TBD

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Workshop / Seminar Wed, 10 Jul 2019 09:38:39 -0400 2019-10-11T12:00:00-04:00 2019-10-11T13:00:00-04:00 Chemistry Dow Lab LSA Biophysics Workshop / Seminar Chemistry Dow Lab
Saturday Morning Physics | What's So Super About Supercomputing? (October 12, 2019 10:30am) https://events.umich.edu/event/66273 66273-16725785@events.umich.edu Event Begins: Saturday, October 12, 2019 10:30am
Location: Weiser Hall
Organized By: Saturday Morning Physics

Supercomputers have been around for decades, but now they impact every aspect of our lives even if we aren't aware of it. Supercomputing isn't just about hardware and software, it is about what supercomputers can be used for, and even more importantly, it is about the human capabilities and efforts that go into using them.

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Workshop / Seminar Wed, 04 Sep 2019 09:51:22 -0400 2019-10-12T10:30:00-04:00 2019-10-12T23:30:00-04:00 Weiser Hall Saturday Morning Physics Workshop / Seminar A Supercomputer, Credit Dan Meisler
Euclidean Black Saddles and AdS4 Black Holes (October 16, 2019 12:00pm) https://events.umich.edu/event/68134 68134-17011973@events.umich.edu Event Begins: Wednesday, October 16, 2019 12:00pm
Location: Randall Laboratory
Organized By: Leinweber Center for Theoretical Physics

The entropy of a class of asymptotically-AdS4 black holes can be reproduced by the partition function of the dual ABJM theory via localization. However, establishing this match requires a particular extremization over field theory parameters. This begs the question: what are the bulk dual geometries when we do not extremize in the field theory? In this talk, I will show that these bulk duals are smooth Euclidean geometries with finitely-capped throats. These geometries generically have no clear interpretation in Lorentzian signature, but when their throat becomes infinitely long they become black holes with an AdS2 near-horizon geometry. For any set of field theory parameters whose extremization is compatible with a black hole, we find a large family of Euclidean geometries whose on-shell action reproduces the ABJM partition function exactly, without the need to extremize,thus establishing a more complete understanding of AdS4/CFT3 holography.

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Lecture / Discussion Mon, 07 Oct 2019 14:32:27 -0400 2019-10-16T12:00:00-04:00 2019-10-16T13:00:00-04:00 Randall Laboratory Leinweber Center for Theoretical Physics Lecture / Discussion Randall Laboratory
Department Colloquium | Quantum Tricks for Detecting Dark Matter Waves (October 16, 2019 4:00pm) https://events.umich.edu/event/65282 65282-16565501@events.umich.edu Event Begins: Wednesday, October 16, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

Low mass dark matter manifests as large amplitude classical bosonic waves which exert subtle forces on sensitive experimental apparatus. In conventional experiments, the tiny predicted signals are swamped by the zero-point noise of the quantum vacuum. In this talk, I will describe current research in surpassing the Standard Quantum Limit in readout noise by utilizing the toolboxes of quantum optics, atomic physics, and quantum computing. Topics include the QCD axion and the vanishing neutron electric dipole moment, quantum non-demolition measurements with superconducting qubits and other metamaterials, and stimulated emission with non-classical sensor preparation.

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Workshop / Seminar Wed, 16 Oct 2019 18:17:17 -0400 2019-10-16T16:00:00-04:00 2019-10-16T17:00:00-04:00 West Hall Department of Physics Workshop / Seminar West Hall
Department Colloquium | Quantum Tricks for Detecting Dark Matter Waves (October 16, 2019 4:00pm) https://events.umich.edu/event/67177 67177-16805258@events.umich.edu Event Begins: Wednesday, October 16, 2019 4:00pm
Location: West Hall
Organized By: Undergrad Physics Events

Low mass dark matter manifests as large amplitude classical bosonic waves which exert subtle forces on sensitive experimental apparatus. In conventional experiments, the tiny predicted signals are swamped by the zero-point noise of the quantum vacuum. In this talk, I will describe current research in surpassing the Standard Quantum Limit in readout noise by utilizing the toolboxes of quantum optics, atomic physics, and quantum computing. Topics include the QCD axion and the vanishing neutron electric dipole moment, quantum non-demolition measurements with superconducting qubits and other metamaterials, and stimulated emission with non-classical sensor preparation.

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Workshop / Seminar Fri, 27 Sep 2019 14:03:06 -0400 2019-10-16T16:00:00-04:00 2019-10-16T17:00:00-04:00 West Hall Undergrad Physics Events Workshop / Seminar West Hall
Department of Computational Medicine & Bioinformatics Weekly Seminar (October 16, 2019 4:00pm) https://events.umich.edu/event/68138 68138-17011980@events.umich.edu Event Begins: Wednesday, October 16, 2019 4:00pm
Location: Palmer Commons
Organized By: DCMB Seminar Series

Talk Title: "3D genome structure as a tool to understand the impact of somatic and germline sequence variants"

Abstract: The 3-dimensional organization of DNA inside of the nucleus impacts a variety of cellular processes, including gene regulation. Furthermore, it is apparent that somatic structural variants that affect how chromatin is organized in 3D can have a major impact on gene regulation and human disease. However, such structural variants in the context of cancer genomes are abundant, and predicting the consequence of any individual somatic mutation on 3D genome structure and gene expression is challenging. In addition, we are severely limited with regard to tools that can be used to study 3D folding of the genome in vivo in actual human tumor or tissue samples. Our lab has developed several approaches to address these challenges. We have taken a pan-cancer approach to identify loci in the genome that are affected by structural variants that alter 3D genome structure, and we have identified numerous loci with recurrent 3D genome altering mutations. We have also used genome engineering to create novel structural variants to better understand what types of mutations are actually capable of altering 3D genome structure and gene regulation. Finally, we have also developed novel tools to study 3D genome structure in vivo in complex tissue samples. We believe that these approaches will be critical for improving our understanding of how non-coding sequence variants can affect 3D genome structure and gene regulation, with the ultimate goal of understanding how these events affect human physiology.

3:45 pm - Light Refreshments Served
4:00 pm - Lecture

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Lecture / Discussion Mon, 07 Oct 2019 16:39:45 -0400 2019-10-16T16:00:00-04:00 2019-10-16T17:00:00-04:00 Palmer Commons DCMB Seminar Series Lecture / Discussion
Complex Systems/MICDE Seminar | Numerical Simulations of Turbulence in Heated Fluids (October 17, 2019 11:30am) https://events.umich.edu/event/67601 67601-16900791@events.umich.edu Event Begins: Thursday, October 17, 2019 11:30am
Location: Weiser Hall
Organized By: The Center for the Study of Complex Systems

This seminar is co-sponsored by the Center for the Study of Complex Systems and the Michigan Institute for Computational Discovery and Engineering

Abstract:
Turbulent systems are all around us, from waves crashing on our beaches, to smoke rising from the fires in our mountains, to the air that can disrupt our smooth airline flights. But, turbulent systems are not well understood. Rayleigh-Benard Convection is a more simplified system which captures some of the key features of turbulence, including thermal plumes, thin boundary layers and large-scale flow. In Rayleigh-Benard convection, an enclosed fluid is bounded by horizontal parallel plates kept at a constant temperature difference. Results from numerical simulations of the equations which describe Rayleigh-Benard convection will be discussed and compared to experimental and theoretical results. These include flows in air and liquid metals in confined containers in addition to more horizontally extended systems.

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Workshop / Seminar Fri, 11 Oct 2019 11:54:18 -0400 2019-10-17T11:30:00-04:00 2019-10-17T13:00:00-04:00 Weiser Hall The Center for the Study of Complex Systems Workshop / Seminar Janet Scheel
HET Seminar | "Quantum Superposition of Massive Bodies" (October 18, 2019 3:00pm) https://events.umich.edu/event/67321 67321-16837721@events.umich.edu Event Begins: Friday, October 18, 2019 3:00pm
Location: West Hall
Organized By: Leinweber Center for Theoretical Physics

We analyse a gedankenexperiment previously considered by Mari et al. that involves quantum superpositions of charged and/or massive bodies ("particles'') under the control of the observers, Alice and Bob. In the electromagnetic case, we show that the quantization of electromagnetic radiation (which causes decoherence of Alice's particle) and vacuum fluctuations of the electromagnetic field (which limits Bob's ability to localize his particle to better than a charge-radius) both are essential for avoiding apparent paradoxes with causality and complementarity. We then analyze the gravitational version of this gedankenexperiment. We show that the analysis of the gravitational case is in complete parallel with the electromagnetic case provided that gravitational radiation is quantized and that vacuum fluctuations limit the localization of a particle to no better than a Planck length. This provides support for the view that (linearized) gravity should have a quantum field description.

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Lecture / Discussion Tue, 24 Sep 2019 10:38:08 -0400 2019-10-18T15:00:00-04:00 2019-10-18T16:00:00-04:00 West Hall Leinweber Center for Theoretical Physics Lecture / Discussion West Hall
Saturday Morning Physics | The Astronet: A Human-Centric Network of Free-Flying Space Co-Robots (October 19, 2019 10:30am) https://events.umich.edu/event/66276 66276-16725786@events.umich.edu Event Begins: Saturday, October 19, 2019 10:30am
Location: Weiser Hall
Organized By: Saturday Morning Physics

In this talk, Professor Panagou will describe her work for the NASA Early Career Faculty Award on the "Astronet": a human-centric robotic network of future space free-fliers (Astrobees) that will assist the astronauts in EVAs and IVAs on the ISS, and for space exploration. She will describe her team's algorithmic developments on the intelligence and autonomy of the Astronet, and on how it can interact and assist astronauts in multi-tasking procedures in unstructured environments. She will show simulations results on an ISS simulator, as well as preliminary experimental results with small quadrotors.

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Workshop / Seminar Thu, 12 Sep 2019 12:01:32 -0400 2019-10-19T10:30:00-04:00 2019-10-19T23:30:00-04:00 Weiser Hall Saturday Morning Physics Workshop / Seminar The Astronet
Quantitative Biology Seminar | Stochastic Turing Patterns in Oceans, Brains and Biofilms (October 21, 2019 12:00pm) https://events.umich.edu/event/68369 68369-17071276@events.umich.edu Event Begins: Monday, October 21, 2019 12:00pm
Location: West Hall
Organized By: Department of Physics

Why are the patterns of plankton in the ocean so patchy? Why do frequently described geometrical hallucinations tend to fall into one of four different classes of pattern? Why don't we see hallucinations all the time? And why do populations in ecosystems tend to have noisy cycles in abundance? This talk explains how these phenomena all arise from the discreteness of the underlying entities, be they the on-off states of neurons or the numbers of bacteria in a fluid volume of ocean, or the number of signaling molecules in a biofilm. I explain how tools from statistical mechanics can yield insights into these phenomena, and report on a range of studies that include the operation of the primate visual cortex, the behavior of signalling molecules in a forward-engineered synthetic biofilm, and the fluctuating patterns and populations of marine organisms.



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Workshop / Seminar Mon, 21 Oct 2019 18:17:04 -0400 2019-10-21T12:00:00-04:00 2019-10-21T13:00:00-04:00 West Hall Department of Physics Workshop / Seminar West Hall
Special CM-AMO Seminar | Inside Nature Physics (October 21, 2019 2:00pm) https://events.umich.edu/event/68304 68304-17045980@events.umich.edu Event Begins: Monday, October 21, 2019 2:00pm
Location: West Hall
Organized By: Department of Physics

Ever wondered what happens behind the scenes at Nature Research journals? We'll discuss what our editors look for in a paper, how we make our decisions, and some tips for writing papers and navigating the submission and review process. Hopefully there will also be plenty of time for questions and discussion.

Bio: David Abergel is an Associate Editor at Nature Physics. After completing a PhD in 2007, he did postdocs at the University of Manitoba and the University of Maryland, before taking a position at Nordita in Stockholm. His research was in condensed-matter theory, mainly focusing on 2D materials and topological materials. In 2017, he joined Nature Physics and is now a full-time editor.

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Workshop / Seminar Mon, 21 Oct 2019 18:17:04 -0400 2019-10-21T14:00:00-04:00 2019-10-21T15:00:00-04:00 West Hall Department of Physics Workshop / Seminar West Hall
HEP-Astro Seminar | Higgs Boson Decay as a Probe to the Unsolved Mysteries in the Universe: dark energy, dark matter and missing antimatter (October 21, 2019 4:00pm) https://events.umich.edu/event/64425 64425-16348357@events.umich.edu Event Begins: Monday, October 21, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

Despite being a remarkably simple theoretical model, the Higgs mechanism is the only known theory that is connected to some of the most profound mysteries in the modern physics: dark energy, dark matter and missing antimatter. Measurements of the Higgs boson decay may shield lights on those open questions. In this talk, I will present a few selective results from the ATLAS experiment on the Higgs boson decays. Namely the first observation of the Higgs boson decay to a pair of b-quarks, which had eluded us for many years despite it is the most probable Higgs decay channel; novel techniques to search for potential new physics using the hardonically decaying Higgs boson, and a first search for singly produced long-lived neutral particle that may be realized via Higgs portal. The talk will mainly focus on general descriptions of the measurements without too much technical details, so that the content is accessible to non experimental particle physicists.

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Workshop / Seminar Mon, 21 Oct 2019 18:17:03 -0400 2019-10-21T16:00:00-04:00 2019-10-21T17:00:00-04:00 West Hall Department of Physics Workshop / Seminar West Hall
HET Brown Bag Seminars | Fine probes of quantum chaos (October 23, 2019 12:00pm) https://events.umich.edu/event/68274 68274-17037498@events.umich.edu Event Begins: Wednesday, October 23, 2019 12:00pm
Location: Randall Laboratory
Organized By: Leinweber Center for Theoretical Physics

Quantum chaotic dynamics manifests itself in transport, thermalization, and the butterfly effect. Hydrodynamics is the universal effective description of transport in the long distance, late time regime. We can gain insight into the process of thermalization from the time evolution of entanglement entropy, for which I introduce an effective theory valid in the hydrodynamic regime. I derive this theory in the special case of holographic gauge theories, and present strong evidence for its validity in any chaotic system. I discuss the interplay between this effective theory and chaotic operator growth that is responsible for the butterfly effect, and present new general results on the Lyapunov exponent characterizing this phenomenon. I conclude with some exciting implications for quantum gravity through gauge/gravity duality.

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Lecture / Discussion Wed, 23 Oct 2019 14:57:03 -0400 2019-10-23T12:00:00-04:00 2019-10-23T13:00:00-04:00 Randall Laboratory Leinweber Center for Theoretical Physics Lecture / Discussion Randall Laboratory
Department Colloquium | Gravitational Waves and Neutron Rich Dense Matter (October 23, 2019 4:00pm) https://events.umich.edu/event/67178 67178-16805259@events.umich.edu Event Begins: Wednesday, October 23, 2019 4:00pm
Location: West Hall
Organized By: Undergrad Physics Events

In 2017 gravitational waves, oscillations of space-time, were detected from the collision of two neutron stars. This historic event provides new insight into very dense neutron rich matter. We compare these observations to the PREX II experiment. PREX uses parity violating electron scattering to precisely locate the 126 neutrons in 208Pb. Despite differing in size by 18 orders of magnitude, both the Pb nucleus and a neutron star are made of the same neutrons, with the same strong interactions, and have the same equation of state (pressure as a function of density). Therefore, PREX II has important implications for neutron star mergers and the structure of neutron stars.

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Workshop / Seminar Wed, 23 Oct 2019 12:47:34 -0400 2019-10-23T16:00:00-04:00 2019-10-23T17:00:00-04:00 West Hall Undergrad Physics Events Workshop / Seminar West Hall
Department Colloquium | Gravitational Waves, Very Dense Matter, and Laboratory Experiments (October 23, 2019 4:00pm) https://events.umich.edu/event/65283 65283-16565502@events.umich.edu Event Begins: Wednesday, October 23, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

In 2017 gravitational waves, oscillations of space-time, were detected from the collision of two neutron stars. This historic event provides new insight into very dense neutron rich matter. We compare these observations to the PREX II experiment. PREX uses parity violating electron scattering to precisely locate the 126 neutrons in 208Pb. Despite differing in size by 18 orders of magnitude, both the Pb nucleus and a neutron star are made of the same neutrons, with the same strong interactions, and have the same equation of state (pressure as a function of density). Therefore, PREX II has important implications for neutron star mergers and the structure of neutron stars.

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Workshop / Seminar Wed, 23 Oct 2019 18:17:02 -0400 2019-10-23T16:00:00-04:00 2019-10-23T17:00:00-04:00 West Hall Department of Physics Workshop / Seminar West Hall
Department of Computational Medicine & Bioinformatics Weekly Seminar Series (October 23, 2019 4:00pm) https://events.umich.edu/event/68168 68168-17020453@events.umich.edu Event Begins: Wednesday, October 23, 2019 4:00pm
Location:
Organized By: DCMB Seminar Series

Talk Title: "Chromatin accessibility signatures of immune system aging"

Abstract: Aging is linked to deficiencies in immune responses and increased systemic inflammation. To unravel regulatory programs behind these changes, we profiled peripheral blood mononuclear cells (PBMCs) from young and old individuals (n=77) using ATAC-seq and RNA-seq technologies and analyzed these data via systems immunology tools. First, we described an epigenomic signature of immune system aging, with simultaneous systematic chromatin closing at promoters and enhancers associated with T cell signaling. This signature was primarily borne by memory CD8+ T cells, which exhibited an aging-related loss in IL7R activity and IL7 responsiveness. More recently to uncover the impact of sex on immune system aging, we studied PBMCs from 194 healthy adults (100 women, 94 men) ranging from 22-93 years old using ATAC-seq, RNA-seq, and flow cytometry technologies. These data revealed a shared epigenomic signature of aging between sexes composed of declines in naïve T cell functions and increases in monocyte and cytotoxic cell functions. Despite similarities, these changes were greater in magnitude in men. Additionally, we uncovered male-specific decreases in expression/accessibility of B-cell associated loci. Trajectory analyses revealed that age-related epigenomic changes were more abrupt at two timepoints in the human lifespan. The first timepoint was similar between sexes in terms of timing (early forties) and magnitude. In contrast, the latter timepoint was earlier (~5 years) and more pronounced in men (mid-sixties versus late-sixties). Unexpectedly, differences between men and women PBMCs increased with aging, with men having higher monocyte and pro-inflammatory activity and lower B/T cell activity compared to women after 65 years of age. Our study uncovered which immune cell functions and molecules are differentially affected with age between sexes, including the differences in timing and magnitude of changes, which is an important step towards precision medicine in older adults.

3:45 pm - Light refreshments served
4:00 pm - Lecture

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Lecture / Discussion Tue, 08 Oct 2019 15:12:18 -0400 2019-10-23T16:00:00-04:00 2019-10-23T17:00:00-04:00 DCMB Seminar Series Lecture / Discussion
Science, Technology, and Public Policy Graduate Certificate Info Session (October 23, 2019 4:00pm) https://events.umich.edu/event/67933 67933-16969022@events.umich.edu Event Begins: Wednesday, October 23, 2019 4:00pm
Location: Weill Hall (Ford School)
Organized By: Science, Technology, and Public Policy (STPP) Program

Join us for an information session about the Science, Technology, and Public Policy (STPP) Graduate Certificate!

Wednesday, October 23rd, 4:00pm-5:00pm
5240 Weill Hall
There will be SNACKS!

Do you want to learn how science and technology policy is made? Are you interested in the social and ethical implications of developments like gene editing and autonomous vehicles? Are you concerned about the increased politicization of science and research funding?

In the STPP graduate certificate program, graduate students from across the University analyze the role of science and technology in the policymaking process, gain experience writing for policymakers, and explore the political and policy landscape of areas such as biotechnology, information technology, energy, and others. Graduates of the STPP certificate have gone on to a range of policy-engaged scientific roles in government, NGOs, and academia.

More information about the program is available at: http://stpp.fordschool.umich.edu/graduate-certificate/

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Presentation Wed, 02 Oct 2019 13:21:49 -0400 2019-10-23T16:00:00-04:00 2019-10-23T17:00:00-04:00 Weill Hall (Ford School) Science, Technology, and Public Policy (STPP) Program Presentation Information Session promotional slide
HET Seminar | Two-loop mixed EW-QCD corrections to Drell-Yan lepton pair production (October 25, 2019 3:00pm) https://events.umich.edu/event/68269 68269-17037493@events.umich.edu Event Begins: Friday, October 25, 2019 3:00pm
Location: West Hall
Organized By: Leinweber Center for Theoretical Physics

Drell-Yan lepton pair production is a key process for precision physics at the Large Hadron Collider. In this talk I will consider the two-loop amplitudes required for the full O(\alpha \alpha_s) corrections to this process and discuss the calculation of the required Feynman integrals. While algebraic linear combinations of the integrals fulfill $\;epsilon$ decoupled differential equations, the symbol letters are provably non-rationalizable. I will show that they can nevertheless be integrated in terms of conventional multiple polylogarithms with algebraic arguments, which allow for fast and stable numerical evaluations.

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Lecture / Discussion Thu, 10 Oct 2019 14:06:55 -0400 2019-10-25T15:00:00-04:00 2019-10-25T16:00:00-04:00 West Hall Leinweber Center for Theoretical Physics Lecture / Discussion West Hall
Saturday Morning Physics | The Birth and Amazing Life of Nonlinear Optics (October 26, 2019 10:30am) https://events.umich.edu/event/66278 66278-16725792@events.umich.edu Event Begins: Saturday, October 26, 2019 10:30am
Location: Weiser Hall
Organized By: Saturday Morning Physics

The birth of the field of nonlinear optics occurred in Randall Laboratory at the University of Michigan in 1961 when Franken, Hill, Peters, and Weinreich observed for the first time the generation of optical harmonics. This discovery was rapidly followed by the observation of numerous other nonlinear effects such as optical rectification, frequency mixing, self-focusing, and parametric oscillation. In this talk we review the physics, birth, growth, and modern day applications of nonlinear optics.

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Workshop / Seminar Wed, 04 Sep 2019 10:04:49 -0400 2019-10-26T10:30:00-04:00 2019-10-26T11:30:00-04:00 Weiser Hall Saturday Morning Physics Workshop / Seminar HERCULES LASER Credit Joseph Xu
HEP-Astro Seminar | Lensing and Delensing: Results and Updates from BICEP/Keck and the South Pole Telescope (October 28, 2019 4:00pm) https://events.umich.edu/event/67014 67014-16796441@events.umich.edu Event Begins: Monday, October 28, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

Gravitational lensing of the cosmic microwave background (CMB) encodes information from the low-redshift universe. Therefore, its measurement is useful for constraining cosmological parameters that describe structure formation, e.g. Omega_m, sigma_8, and the sum of neutrino masses. In this talk, I will present a measurement of and the cosmological constraints from the CMB lensing potential and its power spectrum using data from the SPTpol 500 deg^2 survey. From the minimum variance combination of the lensing estimators from all combinations of SPTpol temperature and polarization data, we measure the lensing amplitude A_MV = 0.944 \pm 0.058 (Stat.) \pm 0.025 (Sys.), which constitutes the tightest lensing amplitude measurement using ground-based CMB data alone. Restricting to only polarization data, we measure the lensing amplitude A_Pol = 0.906 \pm 0.090 (Stat.) \pm 0.040 (Sys.), which is more constraining then our measurement using only temperature data. As SPT-3G, the successor to SPTpol, and other CMB experiments continue to lower the CMB map noise levels, polarization data will dominate the signal-to-noise of lensing measurements for angular multipoles below at least several hundred. Looking to the future, high signal-to-noise measurements of lensing enabled by deep polarization maps is crucial for constraining the sum of neutrino masses and the amplitude of inflationary gravitational waves through delensing. If time permits, I will give an update on the current effort of delensing the BICEP/Keck telescope data.

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Workshop / Seminar Mon, 28 Oct 2019 18:16:53 -0400 2019-10-28T16:00:00-04:00 2019-10-28T17:00:00-04:00 West Hall Department of Physics Workshop / Seminar West Hall
CM-AMO Seminar | Many-body Physics of Ultracold Gases in Synthetic Dimensions: from Self-trapping to Quantum Strings (October 29, 2019 4:00pm) https://events.umich.edu/event/68736 68736-17147124@events.umich.edu Event Begins: Tuesday, October 29, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

Synthetic dimensions alter one of the most fundamental properties in nature, the dimension of space. They allow, for example, a low-dimensional system to act as effectively higher-dimensional. Experiments on ultracold systems create synthetic dimensions using internal or external degrees of freedom of particles for highly controllable quantum simulation.

We consider two methods to create synthetic dimensions in ultracold gases - momentum states of ultracold atoms, and rotational states of ultracold dipolar molecules. In the atomic system with the momentum-state lattice, which has been realized experimentally in the Gadway group, pairs of Raman lasers drive momentum-state transitions, realizing tunnelings in the synthetic lattice. In the molecular system, microwaves can be used to induce rotational-state transitions, realizing tunnelings in the synthetic lattice which can span hundreds of sites. Both systems can show many-body physics due to strong interactions arising respectively from contact interactions and dipolar interactions. We discuss the many-body physics of these systems, ranging from momentum-dependent self-trapping that has been experimentally observed in the atomic systems, to a novel string phase that is theoretically predicted to occur in the molecular systems.

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Workshop / Seminar Tue, 29 Oct 2019 18:16:50 -0400 2019-10-29T16:00:00-04:00 2019-10-29T17:00:00-04:00 West Hall Department of Physics Workshop / Seminar West Hall
HET Brown Bag Seminars | Looking for Axion Dark Matter: from Dwarf Galaxies to Pulsars (October 30, 2019 12:00pm) https://events.umich.edu/event/67394 67394-16846510@events.umich.edu Event Begins: Wednesday, October 30, 2019 12:00pm
Location: Randall Laboratory
Organized By: Leinweber Center for Theoretical Physics

Axion and Axion-like particles are fascinating dark matter candidates and a great effort has been devoted to their study, both theoretically and experimentally. In this talk I will discuss two different astrophysical searches. One consists in looking with radio telescopes for the spontaneous decay of axion dark matter using different targets as Dwarf Galaxies, Clusters or the Galactic Center. The second one uses the parity violating axion interactions to exploit the extreme precision of pulsar timing measurements and look for oscillations in the polarization angle of the pulsar signal.

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Lecture / Discussion Wed, 18 Sep 2019 11:51:02 -0400 2019-10-30T12:00:00-04:00 2019-10-30T13:00:00-04:00 Randall Laboratory Leinweber Center for Theoretical Physics Lecture / Discussion Randall Laboratory
2019 Ta-You Wu Lecture in Physics | Generating High-Intensity, Ultrashort Optical Pulses (October 30, 2019 4:00pm) https://events.umich.edu/event/64676 64676-16426883@events.umich.edu Event Begins: Wednesday, October 30, 2019 4:00pm
Location: Rackham Graduate School (Horace H.)
Organized By: Department Colloquia

With the invention of lasers, the intensity of a light wave was increased by orders of magnitude over what had been achieved with a light bulb or sunlight. This much higher intensity led to new phenomena being observed, such as violet light coming out when red light went into the material. After Gérard Mourou and I developed chirped pulse amplification, also known as CPA, the intensity again increased by more than a factor of 1,000 and it once again made new types of interactions possible between light and matter. We developed a laser that could deliver short pulses of light that knocked the electrons off their atoms. This new understanding of laser-matter interactions, led to the development of new machining techniques that are used in laser eye surgery or micromachining of glass used in cell phones.

You may find more details: lsa.umich.edu/physics/special-lecture

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Lecture / Discussion Thu, 12 Sep 2019 15:38:46 -0400 2019-10-30T16:00:00-04:00 2019-10-30T17:00:00-04:00 Rackham Graduate School (Horace H.) Department Colloquia Lecture / Discussion Donna Strickland, Professor of Physics, University of Waterloo and 2018 Nobel Laureate
Biophysics Talk Title: TBD (November 1, 2019 12:00pm) https://events.umich.edu/event/64274 64274-16274484@events.umich.edu Event Begins: Friday, November 1, 2019 12:00pm
Location: Chemistry Dow Lab
Organized By: LSA Biophysics

Abstract: TBD

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Workshop / Seminar Wed, 10 Jul 2019 09:39:20 -0400 2019-11-01T12:00:00-04:00 2019-11-01T13:00:00-04:00 Chemistry Dow Lab LSA Biophysics Workshop / Seminar Chemistry Dow Lab
HET Seminar | Constraining higher-order gravities with subregion duality (November 1, 2019 3:00pm) https://events.umich.edu/event/68796 68796-17153399@events.umich.edu Event Begins: Friday, November 1, 2019 3:00pm
Location: West Hall
Organized By: Leinweber Center for Theoretical Physics

In higher derivative theories, gravity can propagate faster or slower than light. This fact has consequences for holographic constructs in AdS/CFT. In this talk, I will focus on the causal and entanglement wedges. I will argue that, in higher derivative theories, these wedges should be constructed using the fastest mode instead of null rays. I will show that using this proposal, the property of causal wedge inclusion, i.e. the fact that the causal wedge must be contained in the entanglement wedge, leads to more stringent constraints on the couplings than those imposed by hyperbolicity and boundary causality. I will elaborate on the implications of these results.

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Lecture / Discussion Thu, 24 Oct 2019 09:03:06 -0400 2019-11-01T15:00:00-04:00 2019-11-01T16:00:00-04:00 West Hall Leinweber Center for Theoretical Physics Lecture / Discussion West Hall
Saturday Morning Physics | Who Ordered That? The Marvelous, Mysterious Muon (November 2, 2019 10:30am) https://events.umich.edu/event/66294 66294-16725811@events.umich.edu Event Begins: Saturday, November 2, 2019 10:30am
Location: Weiser Hall
Organized By: Saturday Morning Physics

The muon is a heavier version of the electron and was first discovered in cosmic rays but is now studied extensively in accelerator experiments. Many properties of the muon have been measured with exquisite precision and are essential to our understanding of the interactions of elementary particles, but mysteries remain. This talk will be all about the muon and what we expect to learn by studying this marvelous, mysterious particle.

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Workshop / Seminar Fri, 08 Nov 2019 13:16:44 -0500 2019-11-02T10:30:00-04:00 2019-11-02T11:30:00-04:00 Weiser Hall Saturday Morning Physics Workshop / Seminar Fermilab
HEP-Astro Seminar | Exoplanet Systems as Laboratories for Planet Formation (November 4, 2019 4:00pm) https://events.umich.edu/event/64646 64646-16404982@events.umich.edu Event Begins: Monday, November 4, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

With knowledge of thousands of exoplanet systems from the NASA Kepler Mission, we are closer than ever to understanding how planets form. Patterns in exoplanet populations, compositions, and planetary system architectures are already revealing the most common outcomes of planet formation. I will discuss how I use exoplanet systems as laboratories to test theories of planet formation. My work ranges from characterizing broad patterns across many planetary systems to studying individual systems through their transits, transit timing variations, and radial velocities. In the next ten years, we will measure exoplanet multiplicities, orbital periods, masses, radii, eccentricities, inclinations, obliquities, dynamical interactions, atmospheric compositions, and host star properties using a combination of ground-based and space telescopes. These detailed observations of our exoplanet laboratories will allow us to place the solar system in its galactic context.

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Workshop / Seminar Mon, 04 Nov 2019 18:16:25 -0500 2019-11-04T16:00:00-05:00 2019-11-04T17:00:00-05:00 West Hall Department of Physics Workshop / Seminar West Hall
“Anyone who Thinks He Understands Quantum Mechanics has to have Rocks in His Head“ (November 5, 2019 1:00pm) https://events.umich.edu/event/64657 64657-16410955@events.umich.edu Event Begins: Tuesday, November 5, 2019 1:00pm
Location: Off Campus Location
Organized By: Osher Lifelong Learning Institute (50+)

Quantum physics - the physics of ultra-tiny objects like atoms, molecules, and subatomic particles - is arguably the most successful theory in all of science. It predicts a stunning variety of phenomena to an extraordinary degree of accuracy, and its impact goes well beyond the world of the very small and into our everyday lives.
Yet at its foundation quantum physics is seriously flawed, the orthodox “Copenhagen interpretation” replacing locality with, in Einstein’s words, “spooky action at a distance”; it is at once fundamentally concerned with measurement but unable to define it.
We will discuss this and several other interpretations using physicist/philosopher Adam Becker’s fascinating book, "What is Real?". Please read Part 1 (of 3) for the first session. The fourth session will be a discussion with an expert in the field, TBD (possibly Adam Becker).
Craig Stephan, instructor, is a retired physicist who has led several study groups at OLLI, including ones on cosmology, the Higgs boson, and (concurrently) astrophysics. He is quite sure he does not have rocks in his head. This Study Group is for those 50 and over and meets select Mondays and Tuesdays, 1:00-3:00 pm on November 5, November 12, November 19, and November 25.

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Class / Instruction Sat, 27 Jul 2019 09:16:32 -0400 2019-11-05T13:00:00-05:00 2019-11-05T15:00:00-05:00 Off Campus Location Osher Lifelong Learning Institute (50+) Class / Instruction Study Group
CM/AMO Seminar | X-ray Vision of Spins, Charges and Orbitals for Understanding Emergent electronic States in Complex Oxides (November 5, 2019 4:00pm) https://events.umich.edu/event/65481 65481-16605627@events.umich.edu Event Begins: Tuesday, November 5, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

Many of the most remarkable properties of quantum materials come from the interplay of multiple charge, orbital and spin degrees of freedom. Probing all of these with a single technique is consequently highly desirable. In this talk, I will describe how resonant inelastic x-ray scattering (RIXS) opens up important new possibilities for measuring these degrees of freedom. This includes observing precursor charge density wave correlations in cuprates [1], observing orbital hybridization in iridates [2], and characterizing the spin behavior within the transient state of photo-doped Sr_2IrO_4 [3].

References
1. H. Miao et al., Proc. Natl. Acad. Sci. U.S.A 114, 12430–12435 (2017); H. Miao et al., Phys. Rev. X 8, 011008 (2018); H. Miao et al., Phys. Rev. X 9, 031042 (2019)
2.Y. Wang et al., Phys. Rev. Lett. 122, 106401 (2019)
3. M. P. M. Dean et al., Nature Materials 15, 601-605 (2016); Y. Cao et al., Phil. Trans. R. Soc. A 377: 20170480 (2019)

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Workshop / Seminar Tue, 05 Nov 2019 18:16:20 -0500 2019-11-05T16:00:00-05:00 2019-11-05T17:00:00-05:00 West Hall Department of Physics Workshop / Seminar West Hall
HET Brown Bag Seminars | Extremal Black Holes and EFTs (November 6, 2019 12:00pm) https://events.umich.edu/event/68797 68797-17153400@events.umich.edu Event Begins: Wednesday, November 6, 2019 12:00pm
Location: Randall Laboratory
Organized By: Leinweber Center for Theoretical Physics

Higher-dimension operators in the action modify the extremality condition for black holes. In this talk, I will explore implications for these extremality corrections as a consequence of bounds on Wilson coefficients coming from scattering amplitudes. I will discuss connections to the Weak Gravity Conjecture and generalizations to dyonic, spinning, and BTZ black holes, as well as bounds on Wilson coefficients coming from consistency of black hole entropy.

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Lecture / Discussion Thu, 07 Nov 2019 15:41:48 -0500 2019-11-06T12:00:00-05:00 2019-11-06T13:00:00-05:00 Randall Laboratory Leinweber Center for Theoretical Physics Lecture / Discussion Randall Laboratory
Department Colloquium | Physics Adventures in Cancer Research: Cell Motility, Signaling, and Metastasis (November 6, 2019 4:00pm) https://events.umich.edu/event/67015 67015-16796442@events.umich.edu Event Begins: Wednesday, November 6, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

Struck by the near total absence of physics thinking and methods in biological research, for the last 30 years, the speaker has endeavored to understand certain phenomena utilizing methods that are based on Physics and are applied to the interpretation of complex biological data. She will discuss 3 examples. In conclusion, we will discuss: Are we ready for the Physics laws of Biology?

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Workshop / Seminar Wed, 06 Nov 2019 18:16:15 -0500 2019-11-06T16:00:00-05:00 2019-11-06T17:00:00-05:00 West Hall Department of Physics Workshop / Seminar West Hall
Department Colloquium | Physics Adventures in Cancer Research: Cell Motility, Signaling, and Metastasis (November 6, 2019 4:00pm) https://events.umich.edu/event/67179 67179-16805260@events.umich.edu Event Begins: Wednesday, November 6, 2019 4:00pm
Location: West Hall
Organized By: Undergrad Physics Events

Struck by the near total absence of physics thinking and methods in biological research, for the last 30 years, the speaker has endeavored to understand certain phenomena utilizing methods that are based on Physics and are applied to the interpretation of complex biological data. She will discuss 3 examples. In conclusion, we will discuss: Are we ready for the Physics laws of Biology?

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Workshop / Seminar Wed, 06 Nov 2019 11:37:37 -0500 2019-11-06T16:00:00-05:00 2019-11-06T17:00:00-05:00 West Hall Undergrad Physics Events Workshop / Seminar West Hall
Department of Computational Medicine & Bioinformatics Weekly Seminar (November 6, 2019 4:00pm) https://events.umich.edu/event/68926 68926-17197024@events.umich.edu Event Begins: Wednesday, November 6, 2019 4:00pm
Location: Palmer Commons
Organized By: DCMB Seminar Series

Abstract: Although central architectures drive robust oscillations, biological clock networks containing the same core vary drastically in their potential to oscillate. What peripheral structures contribute to the variation of oscillation behaviors remains elusive. We computationally generated an atlas of oscillators and found that, while certain core topologies are essential for robust oscillations, local structures substantially modulate the degree of robustness. Strikingly, two key local structures, incoherent inputs and coherent inputs, can modify a core topology to promote and attenuate its robustness, additively. These findings underscore the importance of local modifications besides robust cores, which explain why auxiliary structures not required for oscillation are evolutionarily conserved. We further apply this computational framework to search for structures underlying tunability, another crucial property shared by many biological timing systems to adapt their frequencies to environmental changes.

Experimentally, we developed an artificial cell system to reconstitute mitotic oscillatory processes in water-in-oil microemulsions. With a multi-inlet pressure-driven microfluidic setup, these artificial cells are flexibly adjustable in sizes, periods, various molecular and drug concentrations, energy, and subcellular compartments. Using long-term time-lapse fluorescence microscopy, this system enables high-throughput, single-cell analysis of clock dynamics, functions, and stochasticity, key to elucidating the topology-function relation of biological clocks.

We also investigate how multiple clocks coordinate via biochemical and mechanical signals in the essential developmental processes of early zebrafish embryos (e.g., mitotic wave propagation, synchronous embryo cleavages, and somitogenesis). To pin down the physical mechanisms that give rise to these complex collective phenomena, we integrate mathematical modeling, live embryo and explant imaging, nanofabrication, micro-contact printing, and systems and synthetic biology approaches.

BlueJeans livestream: https://primetime.bluejeans.com/a2m/live-event/rbuvycdc
Qiong Yang: https://medicine.umich.edu/dept/dcmb/qiong-yang-phd

3:45 pm to 4:00 pm - Light refreshments
4:00 pm - Lecture

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Lecture / Discussion Tue, 29 Oct 2019 12:56:42 -0400 2019-11-06T16:00:00-05:00 2019-11-06T17:00:00-05:00 Palmer Commons DCMB Seminar Series Lecture / Discussion
CM Theory Seminar | Cyclotron Resonance Spectroscopy of Symmetry Broken States in Monolayer Graphene (November 7, 2019 4:00pm) https://events.umich.edu/event/65284 65284-16565503@events.umich.edu Event Begins: Thursday, November 7, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

Cyclotron resonance—the resonant absorption of light by charge carriers in a strong magnetic field—is widely used to measure the effective band mass of (semi-)conducting materials. This works because the CR absorption in systems having a parabolic dispersion—a reasonable description of most materials—is unaffected by inter-particle interactions. An intriguing corollary is that, for instance, in high mobility GaAs heterostructures when the electronic transport shows remarkably complex behavior in the fractional quantum Hall regime, there is still only a single cyclotron resonance peak that is qualitatively little different from a low-mobility device. But: in materials with a linear dispersion such as graphene, this proscription on spectroscopy of interactions does not hold. We have built a dedicated infrared magnetospectroscopy setup for exploring the cyclotron resonance of interacting Dirac systems, and will report progress including an exciting observation of full integer symmetry breaking of the underlying Landau levels in monolayer graphene. We will also discuss plans for `shining light’ on other correlated electron systems.

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Workshop / Seminar Thu, 07 Nov 2019 18:16:20 -0500 2019-11-07T16:00:00-05:00 2019-11-07T17:00:00-05:00 West Hall Department of Physics Workshop / Seminar West Hall
Life After Graduate School Seminar | Still a Physicist, But Not How I Originally Expected (November 8, 2019 12:00pm) https://events.umich.edu/event/69026 69026-17215883@events.umich.edu Event Begins: Friday, November 8, 2019 12:00pm
Location: West Hall
Organized By: Department of Physics

From experimental HEP, to particle accelerator operations, PET isotope production, and proton beam therapy for treating cancer, my career has differed from what I envisioned years ago. I will share my experience as an example of what one can do with a physics degree after grad school. There is more “out there” than you may think. Questions and discussion will be encouraged.

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Workshop / Seminar Fri, 08 Nov 2019 18:16:44 -0500 2019-11-08T12:00:00-05:00 2019-11-08T13:00:00-05:00 West Hall Department of Physics Workshop / Seminar West Hall
Mathematics Career & Program Fair (November 8, 2019 1:00pm) https://events.umich.edu/event/68640 68640-17128436@events.umich.edu Event Begins: Friday, November 8, 2019 1:00pm
Location:
Organized By: Department of Mathematics

The Mathematics Career Conference is open to all undergraduate and graduate students looking to find out more information about mathematics in industry and graduate programs around the country.

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Fair / Festival Mon, 21 Oct 2019 10:14:23 -0400 2019-11-08T13:00:00-05:00 2019-11-08T16:00:00-05:00 Department of Mathematics Fair / Festival Career Fair
HET Seminars | EDMs and CP-odd nucleon forces (November 8, 2019 3:00pm) https://events.umich.edu/event/68939 68939-17197041@events.umich.edu Event Begins: Friday, November 8, 2019 3:00pm
Location: West Hall
Organized By: Leinweber Center for Theoretical Physics

I will describe two recent papers [in the last stages of preparation]:
1. Paramagnetic EDMs (usually interpreted as electron electric dipole moment)
have seen a lot of experimental progress in the last decade. I evaluate the sensitivity
of electron EDM experiments to hadronic CP-violation, finding an independent limit on
e.g. theta-term at the level of 10^(-8). 2. In the second part of my talk I revisit the question
of CP-odd axion-nucleon vertices, relevant for the searches of the axionic 5th force.

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Lecture / Discussion Tue, 29 Oct 2019 13:59:40 -0400 2019-11-08T15:00:00-05:00 2019-11-08T16:00:00-05:00 West Hall Leinweber Center for Theoretical Physics Lecture / Discussion West Hall
Quantitative Biology Seminar | Experimental Design for Large Scale Virtual Screening (November 11, 2019 12:00pm) https://events.umich.edu/event/68968 68968-17205309@events.umich.edu Event Begins: Monday, November 11, 2019 12:00pm
Location: West Hall
Organized By: Department of Physics

Virtual screening of commercial make-on-demand chemical libraries is a promising strategy for rapid, low-cost drug discovery. However, due to the uncertain predictive accuracy, it is not clear how to best integrate docking into discovery campaigns, an instance of a general problem for applying complex prediction methods. To address this challenge, I will describe how we designed a Bayesian optimal experiment to estimate the hit-rate as a function of predicted free energy of binding by carefully selecting ~500 compounds test in an in vitro binding assay. Using this an example, I will then describe a novel statistical and computational framework for efficiently computing Bayesian optimal designs. The core idea is to use stochastic gradient descent to simultaneously optimize the parameters of variational bounds of the expected information gain and the experimental degrees of freedom. Through implementing this in Pyro a probabilistic programming language built on PyTorch, this method can scale to designing highly informative experiments to calibrate a wide range of predictive models.

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Workshop / Seminar Mon, 11 Nov 2019 18:16:33 -0500 2019-11-11T12:00:00-05:00 2019-11-11T13:00:00-05:00 West Hall Department of Physics Workshop / Seminar West Hall
HEP-Astro Seminar | Searching for Long-lived Particles with Displaced Vertices in ATLAS (November 11, 2019 4:00pm) https://events.umich.edu/event/67016 67016-16796443@events.umich.edu Event Begins: Monday, November 11, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

Most searches for new physics at the Large Hadron Collider assume that a new particle produced in pp-collisions decays almost immediately, or is non-interacting and escapes the detector. However, a variety of new physics models that predict particles which decay inside the detector at a discernible distance from the interaction point. Such long-lived particles would create spectacular signatures and evade many prompt searches. In this talk I will focus on a search for long-lived particles in events with a displaced vertex and a muon. I will also discuss challenges for the Muon Spectrometer in the face of increasing LHC luminosity.

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Workshop / Seminar Mon, 11 Nov 2019 18:16:33 -0500 2019-11-11T16:00:00-05:00 2019-11-11T17:00:00-05:00 West Hall Department of Physics Workshop / Seminar West Hall
CM-AMO Seminar | Playing with a Quantum Toy: Exploring Thermalization Near Integrability with a Magnetic Quantum Newton's Cradle (November 12, 2019 4:00pm) https://events.umich.edu/event/69176 69176-17261053@events.umich.edu Event Begins: Tuesday, November 12, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

Thermalization of near-integrable quantum systems is an unresolved question. We will present a new experiment that explores the emergence of thermalization in a quantum system by studying the dynamics of the momentum in a dipolar quantum Newton's cradle consisting of highly magnetic dysprosium atoms. This system constitutes the first dipolar strongly interacting 1D Bose gas. These interactions provide tunability of both the strength of the integrability-breaking perturbation and the nature of the near-integrable dynamics. The work sheds light on the mechanisms by which isolated quantum many-body systems thermalize and on the temporal structure of the onset of thermalization. We anticipate our novel 1D dipolar gas will yield insights into quantum thermalization and strongly interacting quantum gases with long-range interactions.

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Workshop / Seminar Tue, 12 Nov 2019 18:16:41 -0500 2019-11-12T16:00:00-05:00 2019-11-12T17:00:00-05:00 West Hall Department of Physics Workshop / Seminar West Hall
HET Brown Bag Seminars | "Fundamental Physics with Supernovae and Superconductors" (November 13, 2019 12:00pm) https://events.umich.edu/event/68809 68809-17155478@events.umich.edu Event Begins: Wednesday, November 13, 2019 12:00pm
Location: Randall Laboratory
Organized By: Leinweber Center for Theoretical Physics

In the first part of this talk I will describe how type 1a supernovae (SN) can be used to constrain the interactions of heavy dark matter (DM), which may heat a white dwarf (WD) sufficient to trigger runaway fusion and ignite a SN. Based on the existence of long-lived WDs and the observed supernovae rate, we constrain ultra-heavy DM candidates that produce high energy SM particles in a WD. This rules out supersymmetric Q-ball DM in parameter space complementary to terrestrial bounds. We also constrain DM which is captured by WDs and forms a self-gravitating DM core. Such a core may form a black hole that ignites a SN via Hawking radiation, or which causes ignition via a burst of annihilation during gravitational collapse. It is intriguing that these DM-induced ignition scenarios provide an alternative mechanism of triggering SN from sub-Chandrasekhar mass progenitors. In the second part of the talk, I will present a new technique which utilizes superconducting RF cavities to significantly improve the sensitivity of "light shinning through walls" searches for axion-like particles (ALPs). Our design uses a gapped toroid to confine the static magnetic field responsible for axion-photon conversion, and thereby prevent quenching of the superconducting cavities . Such a search has the potential to probe axion-photon couplings to g ~ 2 x 10^-11 GeV^-1, comparable to future optical and solar searches.

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Lecture / Discussion Thu, 14 Nov 2019 15:45:58 -0500 2019-11-13T12:00:00-05:00 2019-11-13T13:00:00-05:00 Randall Laboratory Leinweber Center for Theoretical Physics Lecture / Discussion Randall Laboratory
Department Colloquium | KOTO: The Search for the Elusive K_L → πνν (November 13, 2019 4:00pm) https://events.umich.edu/event/69170 69170-17259020@events.umich.edu Event Begins: Wednesday, November 13, 2019 4:00pm
Location: West Hall
Organized By: Undergrad Physics Events

The KOTO experiment at J-PARC aims to help explain why we live in a matter dominant universe. It is believed that Charge-Parity (CP) violation is critical in this asymmetry, and studying where new CP violation can enter beyond the predictions of the Standard Model (SM) is an exciting frontier for discovering new physics.

The KOTO experiment was designed to observe and study the 𝐾_L → 𝜋𝜈𝜈 decay. The Standard Model (SM) prediction for the mode is 3.0 x 10^{-11} with a small theoretical uncertainty [1]. A previous experimental upper limit of 2.6 x 10^{-8} was set by the KEK E391a collaboration [2]. The rare “golden” decay is ideal for probing for physics beyond the standard model. A comparison of experimentally obtained results with SM calculations permits a test of the quark flavor region and provides a means to search for new physics.

The signature of the decay is a pair of photons from the π^0 decay and no other detected particles. For the measurement of the energies and positions of the photons, KOTO uses a Cesium Iodide (CSI) electromagnetic calorimeter as the main detector, and hermetic veto counters to guarantee that there are no other detected particles.

KOTO’s initial data was collected in 2013 and achieved a similar sensitivity as E391a result [3]. Since then, we completed hardware upgrades and had additional physics runs in 2015, 2016- 2018, and earlier this year. This presentation will present the motivation for this study, new results from KOTO [4], and discuss the status of the ongoing search in detecting 𝐾_L → 𝜋𝜈𝜈.

[1] C. Bobeth, A. J. Buras, A. Celis, and M. Jung, J. High Energy Phys. 04, 079 (2017). [2] J. K. Ahn et al., Phys. Rev. D 81, 072004 (2010).
[3] J. K. Ahn et al., Prog. Theor. Phys. 021C01 (2017).
[4] J. K. Ahn et al., Phys. Rev. Lett. 122 no.2, 021802 (2019

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Workshop / Seminar Wed, 06 Nov 2019 11:35:46 -0500 2019-11-13T16:00:00-05:00 2019-11-13T17:00:00-05:00 West Hall Undergrad Physics Events Workshop / Seminar West Hall
Department Colloquium | The Search for the Elusive K_L → πνν with the KOTO Detector (November 13, 2019 4:00pm) https://events.umich.edu/event/69073 69073-17224170@events.umich.edu Event Begins: Wednesday, November 13, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

The KOTO experiment at J-PARC aims to help explain why we live in a matter dominant universe. It is believed that Charge-Parity (CP) violation is critical in this asymmetry, and studying where new CP violation can enter beyond the predictions of the Standard Model (SM) is an exciting frontier for discovering new physics.

The KOTO experiment was designed to observe and study the 𝐾_L → 𝜋𝜈𝜈 decay. The Standard Model (SM) prediction for the mode is 3.0 x 10^{-11} with a small theoretical uncertainty [1]. A previous experimental upper limit of 2.6 x 10^{-8} was set by the KEK E391a collaboration [2]. The rare “golden” decay is ideal for probing for physics beyond the standard model. A comparison of experimentally obtained results with SM calculations permits a test of the quark flavor region and provides a means to search for new physics.

The signature of the decay is a pair of photons from the π^0 decay and no other detected particles. For the measurement of the energies and positions of the photons, KOTO uses a Cesium Iodide (CSI) electromagnetic calorimeter as the main detector, and hermetic veto counters to guarantee that there are no other detected particles.

KOTO's initial data was collected in 2013 and achieved a similar sensitivity as E391a result [3]. Since then, we completed hardware upgrades and had additional physics runs in 2015, 2016- 2018, and earlier this year. This presentation will present the motivation for this study, new results from KOTO [4], and discuss the status of the ongoing search in detecting 𝐾_L → 𝜋𝜈𝜈.

[1] C. Bobeth, A. J. Buras, A. Celis, and M. Jung, J. High Energy Phys. 04, 079 (2017). [2] J. K. Ahn et al., Phys. Rev. D 81, 072004 (2010).
[3] J. K. Ahn et al., Prog. Theor. Phys. 021C01 (2017).
[4] J. K. Ahn et al., Phys. Rev. Lett. 122 no.2, 021802 (2019

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Workshop / Seminar Wed, 13 Nov 2019 18:16:40 -0500 2019-11-13T16:00:00-05:00 2019-11-13T17:00:00-05:00 West Hall Department of Physics Workshop / Seminar West Hall
Department of Computational Medicine & Bioinformatics Seminar (November 13, 2019 4:00pm) https://events.umich.edu/event/68641 68641-17128443@events.umich.edu Event Begins: Wednesday, November 13, 2019 4:00pm
Location: Palmer Commons
Organized By: DCMB Seminar Series

Talk Title: Reproducibility with high-dimensional data

Abstract: With the expanding generation of large-scale biological datasets, there has been an ever-greater concern in understanding the reproducibility of discoveries and findings in a statistically reliable manner. We review several concepts in reproducibility and describe how one can adopt a multiple testing perspective on the problem. This leads to an intuitive procedure for assessing reproducibility. We demonstrate application of the methodology using RNA-sequencing data as well as metabolomics datasets. We will also outline some further problems in the field.

This is joint work with Daisy Philtron, Yafei Lyu and Qunhua Li (Penn State) and Tusharkanti Ghosh, Weiming Zhang and Katerina Kechris (University of Colorado).

DCMB Faculty Host: Alla Karnovsky, PhD

3:45 p.m. - Light Refreshments
4:00 p.m. - Lecture

BlueJeans Live Streaming: https://primetime.bluejeans.com/a2m/live-event/rbuvycdc

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Lecture / Discussion Mon, 21 Oct 2019 11:05:22 -0400 2019-11-13T16:00:00-05:00 2019-11-13T17:00:00-05:00 Palmer Commons DCMB Seminar Series Lecture / Discussion
Special Cosmology Seminar | Preheating on Curved Field-Space Manifolds (November 14, 2019 12:00pm) https://events.umich.edu/event/69271 69271-17277410@events.umich.edu Event Begins: Thursday, November 14, 2019 12:00pm
Location: Randall Laboratory
Organized By: Department Colloquia

I will discuss preheating in multi-field models of inflation with a curved field-space manifold. In the case of two-field generalizations of $\alpha$-attractor models with is a highly curved hyperbolic field-space manifold, analytical progress can be made for preheating using the WKB approximation and Floquet analysis. I will show the emergence of a simple scaling behavior of the Floquet exponents for large values of the field-space curvature, that enables a quick estimation of the reheating efficiency for any large value of the field-space curvature. In this regime one can observe and explain universal preheating features that arise for different values of the potential steepness. In general preheating is faster for larger negative values of the field-space curvature and steeper potentials. For very highly curved field-space manifolds preheating is essentially instantaneous.
In case of multi-field models with non-minimal couplings, where the field-space in the Einstein frame is highly curved near the origin, I will describe recent lattice simulations that have been used to capture significant nonlinear effects like backreaction and rescattering. I will show how we can we extract the effective equation of state and typical time-scales for the onset of thermalization, quantities that could affect the usual mapping between predictions for primordial perturbation spectra and measurements of anisotropies in the cosmic microwave background radiation. For large values of the nonminimal coupling constants, efficient particle production gives rise to nearly instantaneous preheating. Moreover, the strong single-field attractor behavior that was identified for these models in linearized analyses remains robust in the full theory, and in all cases considered the attractor persists until the end of preheating. Finally, I will discuss the implications for Higgs inflation.

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Workshop / Seminar Fri, 08 Nov 2019 15:43:27 -0500 2019-11-14T12:00:00-05:00 2019-11-14T13:00:00-05:00 Randall Laboratory Department Colloquia Workshop / Seminar Randall Laboratory
Biophysics Talk Title: TBD (November 15, 2019 12:00pm) https://events.umich.edu/event/64282 64282-16274493@events.umich.edu Event Begins: Friday, November 15, 2019 12:00pm
Location: Chemistry Dow Lab
Organized By: LSA Biophysics

Abstracts: TBD

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Workshop / Seminar Wed, 10 Jul 2019 11:29:18 -0400 2019-11-15T12:00:00-05:00 2019-11-15T13:00:00-05:00 Chemistry Dow Lab LSA Biophysics Workshop / Seminar Chemistry Dow Lab
Life After Graduate School Seminar | Double Feature (November 15, 2019 12:00pm) https://events.umich.edu/event/69153 69153-17254948@events.umich.edu Event Begins: Friday, November 15, 2019 12:00pm
Location: West Hall
Organized By: Department of Physics

Life After Grad School Seminar

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Workshop / Seminar Fri, 15 Nov 2019 18:16:35 -0500 2019-11-15T12:00:00-05:00 2019-11-15T13:00:00-05:00 West Hall Department of Physics Workshop / Seminar West Hall
HET Seminars | “A Canonical Purification for the Entanglement Wedge Cross-Section” (November 15, 2019 2:00pm) https://events.umich.edu/event/69282 69282-17293660@events.umich.edu Event Begins: Friday, November 15, 2019 2:00pm
Location: West Hall
Organized By: Leinweber Center for Theoretical Physics

I will discuss a new entry in the AdS/CFT dictionary relating a geometric quantity called the entanglement wedge cross-section to the entropy of a canonical purification. I will also speculate about a connection to the split property in QFT.

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Lecture / Discussion Thu, 14 Nov 2019 10:17:43 -0500 2019-11-15T14:00:00-05:00 2019-11-15T15:00:00-05:00 West Hall Leinweber Center for Theoretical Physics Lecture / Discussion West Hall
Saturday Morning Physics | Supermassive Black Holes and You (November 16, 2019 10:30am) https://events.umich.edu/event/66283 66283-16725803@events.umich.edu Event Begins: Saturday, November 16, 2019 10:30am
Location: Weiser Hall
Organized By: Saturday Morning Physics

A supermassive black hole may have played a more important role in your existence than you might have thought. You might want to sit down for this.

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Workshop / Seminar Fri, 06 Sep 2019 15:23:35 -0400 2019-11-16T10:30:00-05:00 2019-11-16T11:30:00-05:00 Weiser Hall Saturday Morning Physics Workshop / Seminar Hubble Space Telescope photos of two very active central galaxies in two different clusters of galaxies
HEP-Astro Seminar | Forward Modelling the Universe: Application to Cosmic Shear (November 18, 2019 4:00pm) https://events.umich.edu/event/67017 67017-16796444@events.umich.edu Event Begins: Monday, November 18, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

Observational cosmology is going through a golden age. In particular, we are in the midst of an influx of data from on-going experiments, such as the Dark Energy Survey (DES). In the coming five years, the volume and quality of data will rapidly increase as Stage IV surveys, Euclid, LSST and WFIRST, come online. Processing this data will require new algorithms and methods to maximise our science reach and to control for systematic errors. In this talk, I will present a method that we have developed called Monte-Carlo-Control-Loops that relies heavily on forward modelling the observed data by simulating all the processes from cosmology theory to images. Given the complexities of the late-time Universe, these forward models need to capture the important properties of galaxy populations and key features imprinted on the data from the experiments themselves. By bringing together all these elements with advanced statistical methods and new machine learning algorithms, we can build a process for extracting maximal information from the new data, which will allow us to extensively test the physics of the dark sector.

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Workshop / Seminar Mon, 18 Nov 2019 18:16:20 -0500 2019-11-18T16:00:00-05:00 2019-11-18T17:00:00-05:00 West Hall Department of Physics Workshop / Seminar West Hall
HET Brown Bag Seminars | A Mellin Space Approach to Scattering in de Sitter Space (November 20, 2019 12:00pm) https://events.umich.edu/event/69298 69298-17299783@events.umich.edu Event Begins: Wednesday, November 20, 2019 12:00pm
Location: Randall Laboratory
Organized By: Leinweber Center for Theoretical Physics

Boundary correlators in (anti)-de Sitter space-times are notoriously difficult beasts to tame. In AdS, where such observables are equivalent to CFT correlation functions, recent years have seen significant progress in our understanding of their structure owing to the development of numerous systematic techniques, many of which have drawn inspiration from the successes and the strengths of the scattering amplitudes programme in flat space. In dS however, the problem is more complicated owing to the time-dependence of the background and it is unclear how consistent time evolution is encoded in spatial correlations on the boundary. This makes application of our hard-earned wisdom from flat and AdS spaces far from straightforward. In this talk we explain how boundary correlators in AdS and dS can be placed on an equal footing by adopting a Mellin-Barnes representation in momentum space, providing a framework in which techniques and results available in AdS can be generalised to de Sitter. This connection allows us to systematically derive expressions for exchange diagrams in de Sitter involving fields with and without spin. Throughout we shall keep in mind applications to the classification of possible non-Gaussianities in cosmological correlation functions, of both scalar and tensor fluctuations.

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Lecture / Discussion Thu, 21 Nov 2019 10:10:00 -0500 2019-11-20T12:00:00-05:00 2019-11-20T13:00:00-05:00 Randall Laboratory Leinweber Center for Theoretical Physics Lecture / Discussion Randall Laboratory
DCMB Weekly Seminar (November 20, 2019 4:00pm) https://events.umich.edu/event/68972 68972-17205312@events.umich.edu Event Begins: Wednesday, November 20, 2019 4:00pm
Location: Palmer Commons
Organized By: DCMB Seminar Series

Abstract: GWAS of neuropsychiatric diseases have identified many loci, however, causal variants often remain unknown. We performed ATAC-seq in human iPSC-derived neurons, and identified thousands of variants affecting chromatin accessibility. Such variants are highly enriched with risk variants of a range of brain disorders. We computationally fine-mapped causal variants and experimentally tested their activities using CRISPRi followed by single cell RNA-seq. Our work provides a framework for prioritizing noncoding disease variants.

The second part of my talk will be focused on genetics of N6-methyladenosine (m6A), a common form of mRNA modification. m6A plays an important role in regulating various aspects of mRNA metabolism in eukaryotes. However, little is known about how DNA sequence variations may affect the m6A modification and the role of m6A in common diseases. We mapped genetic variants associated with m6A levels in 60 Yoruba lymphoblast cell lines. By leveraging these variants, our analysis provides novel insights of mechanisms regulating m6A installation, and downstream effects of m6A on other molecular traits such as translation rate. Integrated analysis with GWAS data reveals m6A variation as an important mechanism linking genetic variations to complex diseases.

BlueJeans livestreaming link: https://primetime.bluejeans.com/a2m/live-event/rbuvycdc

3:45 p.m. - Light Refreshments
4:00 p.m. - Lecture

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Lecture / Discussion Wed, 30 Oct 2019 12:51:34 -0400 2019-11-20T16:00:00-05:00 2019-11-20T17:00:00-05:00 Palmer Commons DCMB Seminar Series Lecture / Discussion
Department Colloquium | The Joys and Challenges in Changing to the Scale Up Paradigm (November 20, 2019 4:00pm) https://events.umich.edu/event/65285 65285-16565504@events.umich.edu Event Begins: Wednesday, November 20, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

Even before Purdue opened its Active Learning Center, I staked my claim to a room designed according to the SCALE UP model. Having stuck out my neck, I then had to jump in with both feet. I will share my experience in converting the introductory mechanics course– one of the major gateways required of all first-year engineering majors.

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Workshop / Seminar Wed, 20 Nov 2019 18:16:33 -0500 2019-11-20T16:00:00-05:00 2019-11-20T17:00:00-05:00 West Hall Department of Physics Workshop / Seminar West Hall
Department Colloquium | The Joys and Challenges in Changing to the Scale Up Paradigm (November 20, 2019 4:00pm) https://events.umich.edu/event/69172 69172-17259021@events.umich.edu Event Begins: Wednesday, November 20, 2019 4:00pm
Location: West Hall
Organized By: Undergrad Physics Events

Even before Purdue opened its Active Learning Center, I staked my claim to a room designed according to the SCALE UP model. Having stuck out my neck, I then had to jump in with both feet. I will share my experience in converting the introductory mechanics course– one of the major gateways required of all first-year engineering majors.

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Workshop / Seminar Wed, 06 Nov 2019 11:39:29 -0500 2019-11-20T16:00:00-05:00 2019-11-20T17:00:00-05:00 West Hall Undergrad Physics Events Workshop / Seminar West Hall
Special Cosmology Seminar | The Robustness of Slow Contraction to Initial Conditions, and Other Perks of Bouncing (November 21, 2019 12:00pm) https://events.umich.edu/event/69531 69531-17357969@events.umich.edu Event Begins: Thursday, November 21, 2019 12:00pm
Location: Randall Laboratory
Organized By: Department Colloquia

In this talk, I will discuss how a slowly-contracting primordial epoch generically smooths and flattens the universe, using the full power of numerical general relativity. In addition, I will review recent progress on studying the generation of primordial perturbations as well as constructing smooth cosmological bounces.

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Workshop / Seminar Mon, 18 Nov 2019 08:32:10 -0500 2019-11-21T12:00:00-05:00 2019-11-21T13:00:00-05:00 Randall Laboratory Department Colloquia Workshop / Seminar Randall Laboratory
Biophysics Talk Title: TBD (November 22, 2019 12:00pm) https://events.umich.edu/event/64275 64275-16274485@events.umich.edu Event Begins: Friday, November 22, 2019 12:00pm
Location: Chemistry Dow Lab
Organized By: LSA Biophysics

Abstract: TBD

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Workshop / Seminar Wed, 10 Jul 2019 09:39:35 -0400 2019-11-22T12:00:00-05:00 2019-11-22T13:00:00-05:00 Chemistry Dow Lab LSA Biophysics Workshop / Seminar Chemistry Dow Lab
HET Seminars | Illuminating the Early Universe with Dark Matter Minihalos (November 22, 2019 3:00pm) https://events.umich.edu/event/69401 69401-17318564@events.umich.edu Event Begins: Friday, November 22, 2019 3:00pm
Location: West Hall
Organized By: Leinweber Center for Theoretical Physics

As remnants of the earliest stages of structure formation, the smallest dark matter halos provide a unique probe of the density fluctuations generated during inflation and the evolution of the Universe shortly after inflation. The absence of early-forming ultra-compact minihalos (UCMHs) establishes an upper bound on the amplitude of the primordial power spectrum on small scales and has been used to constrain inflationary models. I will show how numerical simulations of UCMH formation reveal that these constraints need to be revised because the dark matter annihilation rate within UCMHs is lower than has been assumed. Nevertheless, we have found that minihalos can still provide unrivaled constraints on the small-scale primordial power spectrum. The abundance of minihalos also encodes information about the evolution of the Universe prior to Big Bang nucleosynthesis (BBN). I will discuss how the pre-BBN thermal history can enhance the minihalo population, thereby boosting the dark matter annihilation rate if dark matter is a thermal relic. Conversely, the nonthermal production of dark matter can suppress the small-scale power spectrum. It is therefore possible to use gamma-ray observations and observations of the Lyman-α forest to learn about the origins of dark matter and the evolution of the Universe during its first second.

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Lecture / Discussion Wed, 13 Nov 2019 13:26:28 -0500 2019-11-22T15:00:00-05:00 2019-11-22T16:00:00-05:00 West Hall Leinweber Center for Theoretical Physics Lecture / Discussion West Hall
Saturday Morning Physics | Scientific Publishing: How Wrong is it to Publish in the Right Journals? (November 23, 2019 10:30am) https://events.umich.edu/event/66289 66289-16725807@events.umich.edu Event Begins: Saturday, November 23, 2019 10:30am
Location: Weiser Hall
Organized By: Saturday Morning Physics

Scholars need to communicate their research in order to advance science and to promote the understanding of the human experience. The future of scientific publishing may very well rest on our ability to flip the current model that serves the interests of a few for-profit publishers to a model that has incentives to serve the interests of humanity. This talk will introduce a number of strategies that might be employed to create a more just and sustaining scientific publishing system.

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Workshop / Seminar Fri, 06 Sep 2019 16:26:46 -0400 2019-11-23T10:30:00-05:00 2019-11-23T11:30:00-05:00 Weiser Hall Saturday Morning Physics Workshop / Seminar UMich Law Library
HEP-Astro Seminar | The Degree of Fine-Tuning in our Universe -- and Possibly Others (November 25, 2019 4:00pm) https://events.umich.edu/event/67018 67018-16796445@events.umich.edu Event Begins: Monday, November 25, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

The fundamental constants of nature must fall within a range of values in order for the universe to develop structure and ultimately support life. This talk considers the current constraints on these quantities and assesses the degree of fine-tuning required for the universe to be viable. The first step is to determine what parameters are allowed to vary. In the realm of particle physics, we must specify the strengths of the fundamental forces and the particle masses. The relevant cosmological parameters include the density of the universe, the cosmological constant, the abundance of ordinary matter, the dark matter contribution, and the amplitude of primordial density fluctuations. These quantities are constrained by the requirements that the universe lives for a sufficiently long time, emerges from its early epochs with an acceptable chemical composition, and can successfully produce galaxies. On smaller scales, stars and planets must be able to form and function. The stars must have sufficiently long lifetimes and hot surface temperatures. The planets must be large enough to maintain atmospheres, small enough to remain non-degenerate, and contain enough particles to support a biosphere. We also consider specific fine-tuning issues in stars, including the triple alpha reaction that produces carbon, the case of unstable deuterium, and the possibility of stable diprotons. For all of these issues, the goal of this enterprise is to delineate the range of parameter space for which universes can remain habitable.

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Workshop / Seminar Mon, 25 Nov 2019 18:16:09 -0500 2019-11-25T16:00:00-05:00 2019-11-25T17:00:00-05:00 West Hall Department of Physics Workshop / Seminar West Hall
HEP-Astro Seminar | Dark Matter Searches in LZ and Beyond (December 2, 2019 1:00pm) https://events.umich.edu/event/69733 69733-17392933@events.umich.edu Event Begins: Monday, December 2, 2019 1:00pm
Location: West Hall
Organized By: HEP - Astro Seminars

LZ will be the world's most sensitive dark matter direct detection experiment, starting to take data in Spring 2020. The experiment is located 1 mi underground in the Sanford Underground Research Facility (SURF) in Lead, SD. LZ consists of a central time projection chamber (TPC) containing 7 tonnes of liquid xenon as dark matter target surrounded by an outer detector (OD) with 17 tonnes of gadolinium doped liquid scintillator to veto neutrons. I will highlight my group's research contributions to TPC assembly as well as to design and manufacturing of the OD. I will demonstrate how the equipment we built, combined with my analysis and phenomenological experience, will lead to most the sensitive searches including novel signatures. The use of active veto detectors has been adopted by all upcoming direct dark matter experiments and are indispensable to the future of the field. I will present status of my program to develop novel scintillating detectors including the first concepts for future veto detectors for the next generation of dark matter experiments.

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Workshop / Seminar Wed, 27 Nov 2019 09:41:07 -0500 2019-12-02T13:00:00-05:00 2019-12-02T14:00:00-05:00 West Hall HEP - Astro Seminars Workshop / Seminar West Hall
HEP-Astro Seminar | SUSY Searches with ATLAS and Potential Improvements from Track Triggers (December 2, 2019 4:00pm) https://events.umich.edu/event/66923 66923-16787709@events.umich.edu Event Begins: Monday, December 2, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

The lack of evidence for SUSY at the LHC motivates new search strategies such as looking for scenarios with small mass differences between SUSY particles. However, this can bring challenges because of lower momentum visible decay products. SUSY searches with two leptons offer the possibility to use unique shapes in the invariant mass spectrum as an additional discriminant. In this talk, I will go through the details of ATLAS SUSY searches with two leptons, and show some highlights of recent SUSY results. Additionally, I will discuss how track triggers can enhance the discovery reach of these searches, focusing on the ATLAS Fast TracKer as an example along with its Phase-II counterpart.

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Workshop / Seminar Mon, 02 Dec 2019 18:16:24 -0500 2019-12-02T16:00:00-05:00 2019-12-02T17:00:00-05:00 West Hall Department of Physics Workshop / Seminar West Hall
CM-AMO Seminar | Double Feature - Observation of a Ferro-Rotational Order Coupled with Second-Order Nonlinear Optical Fields & Information Scrambling in Quantum Phases (December 3, 2019 4:00pm) https://events.umich.edu/event/66974 66974-16789923@events.umich.edu Event Begins: Tuesday, December 3, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

Elizabeth Drueke
U-M Physics

Observation of a Ferro-rotational Order Coupled with Second-order Nonlinear Optical Fields

In this talk, I will discuss our recent discovery of ferrorotational order in RbFe(MoO4)2. Classified by an order parameter which is an axial vector invariant under both time-reversal and spatial-inversion operations, this order is closely related to a number of phenomena such as polar vortices, giant magnetoelectric coupling and spin-helicity-driven ferroelectricity, but it has received little attention so far. Here, using high-sensitivity rotational-anisotropy second-harmonic generation, we have exploited the electric quadrupole contribution to the second harmonic generation to directly couple to this centrosymmetric ferro-rotational order in an archetype of type-II multiferroics, RbFe(MoO4)2. We found that two domain states with opposite ferro-rotational vectors emerge with distinct populations at the critical temperature Tc ≈ 195 K and gradually evolve to reach an even ratio at lower temperatures. Moreover, we have identified the ferro-rotational order phase transition as weakly first order and have revealed its coupling field as a unique combination of the induced electric quadrupole second-harmonic generation and the incident fundamental electric fields.


Ceren Dag
U-M Physics

Information Scrambling in Quantum Phases

Out-of-time-order correlators (OTOCs) are well-established tools for studying quantum chaos in quantum many-body systems as well as information properties of black holes. They characterize the information scrambling which is a dynamical phenomenon where both spatial and temporal correlations spread across a many-body system. Recently an unexpected relation between symmetry-breaking quantum phase transitions and information scrambling has been numerically observed. We introduce a new theoretical tool to understand the reasons and the mechanism of this relation, which makes the dynamical detection of long-range ordered quantum phases via OTOCs intuitive. Based on the studies in literature and our numerical results in the XXZ model, our method renders the relation between information scrambling and quantum phase transitions universal.

Speaker Information: Ceren B. Dag is a graduate student in the Physics Department at the University of Michigan Ann Arbor. She works towards her PhD thesis with Kai Sun and Luming Duan.

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Workshop / Seminar Mon, 02 Dec 2019 09:38:15 -0500 2019-12-03T16:00:00-05:00 2019-12-03T17:00:00-05:00 West Hall Department of Physics Workshop / Seminar West Hall
HET SEMINAR | Extending the Double Copy (December 4, 2019 12:00pm) https://events.umich.edu/event/69764 69764-17417427@events.umich.edu Event Begins: Wednesday, December 4, 2019 12:00pm
Location: West Hall
Organized By: Leinweber Center for Theoretical Physics

I will discuss several recent papers on the double copy. In the first part of the talk I will recap work extending the classical double copy correspondence to maximally symmetric curved spacetimes. I will describe how to construct the corresponding single and zeroth copies in asymptotically (A)dS spacetimes in Kerr-Schild form, and will clarify the interpretation of these copies using several examples, pointing out some peculiar features. In the second part of the talk, I will introduce Galileon fields, and will discuss how to generalize and extend the procedure relating gauge and gravity theories through color-kinematics replacements by showing that the classical perturbative double copy of pions corresponds to special Galileons. I will also show how to construct the single copy by mapping the bi-adjoint scalar radiation to the non-linear sigma model radiation through generalized color-kinematics replacements. Finally, if time permits, I will introduce work studying the double copy beyond leading order.

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Lecture / Discussion Mon, 25 Nov 2019 12:25:35 -0500 2019-12-04T12:00:00-05:00 2019-12-04T13:00:00-05:00 West Hall Leinweber Center for Theoretical Physics Lecture / Discussion West Hall
Department Colloquium | Controlling Dissipation in Superconductors: the Oxymoron that Leads to New Superconducting Phases and Transitions (December 4, 2019 4:00pm) https://events.umich.edu/event/65286 65286-16565505@events.umich.edu Event Begins: Wednesday, December 4, 2019 4:00pm
Location: West Hall
Organized By: Department of Physics

Superconductors are exciting materials for basic physics and applications because they conventionally exhibit zero-resistance and zero-dissipation (i.e., no energy loss). However, unconventional superconductors—including high-temperature superconductors and hybrid superconductor-normal (S-N) systems relevant to quantum computation—combine superconductivity with dissipative normal metal-like states. Yet dissipation has been difficult to control and parametrize. In this talk, I will discuss electrical transport experiments on hybrid superconductor-normal metal systems where the dissipation is controlled, leading to new understanding of superconducting states and transitions. In particular, I will show how superconductivity is established in granular S-N systems, how metallic states appear in arrays of S-N systems as the normal metal fraction is increased, and how magnetic fields can be used to control a variety of dissipative phase transitions. The results are relevant to understanding the role of dissipation in superconducting systems, and in correlated materials in general.

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Workshop / Seminar Wed, 04 Dec 2019 18:16:23 -0500 2019-12-04T16:00:00-05:00 2019-12-04T17:00:00-05:00 West Hall Department of Physics Workshop / Seminar West Hall
Department Colloquium | Controlling Dissipation in Superconductors: the Oxymoron that Leads to New Superconducting Phases and Transitions (December 4, 2019 4:00pm) https://events.umich.edu/event/67181 67181-16805264@events.umich.edu Event Begins: Wednesday, December 4, 2019 4:00pm
Location: West Hall
Organized By: Undergrad Physics Events

Superconductors are exciting materials for basic physics and applications because they conventionally exhibit zero-resistance and zero-dissipation (i.e., no energy loss). However, unconventional superconductors—including high-temperature superconductors and hybrid superconductor-normal (S-N) systems relevant to quantum computation—combine superconductivity with dissipative normal metal-like states. Yet dissipation has been difficult to control and parametrize. In this talk, I will discuss electrical transport experiments on hybrid superconductor-normal metal systems where the dissipation is controlled, leading to new understanding of superconducting states and transitions. In particular, I will show how superconductivity is established in granular S-N systems, how metallic states appear in arrays of S-N systems as the normal metal fraction is increased, and how magnetic fields can be used to control a variety of dissipative phase transitions. The results are relevant to understanding the role of dissipation in superconducting systems, and in correlated materials in general.

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Workshop / Seminar Mon, 25 Nov 2019 08:09:38 -0500 2019-12-04T16:00:00-05:00 2019-12-04T17:00:00-05:00 West Hall Undergrad Physics Events Workshop / Seminar West Hall
Life After Graduate School Seminar | From Natural Laws to Writing Laws: A Physicist Turned Policymaker (December 6, 2019 12:00pm) https://events.umich.edu/event/67593 67593-16900781@events.umich.edu Event Begins: Friday, December 6, 2019 12:00pm
Location: West Hall
Organized By: Department of Physics

The US federal government touches all aspects of our lives through its ~$4.5 trillion annual budget (although less than 4% is for research and development), laws, regulations, rules, and policies. Dr. Anna Quider will discuss her experience as a physicist-turned-policymaker working within the federal government at the U.S. House of Representatives and U.S. Department of State, and external to the federal government as a higher education and science advocate. Attendees will learn about career paths into federal policymaking and how input from physicists and the public inform the federal policymaking process. Dr. Quider is presently the Assistant Vice President for Federal Relations for Northern Illinois University and the past-president of The Science Coalition, a national nonprofit dedicated to increasing US federal funding for fundamental scientific research. She was a 2011 APS Congressional Science Fellow and 2012 AAAS Science and Technology Policy Fellow.


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Workshop / Seminar Fri, 06 Dec 2019 18:16:18 -0500 2019-12-06T12:00:00-05:00 2019-12-06T13:00:00-05:00 West Hall Department of Physics Workshop / Seminar West Hall
HET Seminar | UV and IR properties of quantum gravity from amplitudes (December 6, 2019 3:00pm) https://events.umich.edu/event/69833 69833-17433861@events.umich.edu Event Begins: Friday, December 6, 2019 3:00pm
Location: West Hall
Organized By: Leinweber Center for Theoretical Physics

Using the general unitarity cuts method and amplitudes approach, we calculate the 4-point all-plus-helicity graviton amplitudes at 2-loop. This reproduces a well-known result about 2-loop divergence in quantum gravity, and more importantly, we figure out a very simple renormalization scale dependence of gravity theories at 2-loop. And from this scale dependence, we conclude the duality between scalar and 2-form, between 3-form and cosmological constant at quantum level. And after this direct but complicated calculation, we figure out an alternative simple derivation by doing the cuts and integration in 4d, instead of 4-2e dimension. This elucidates the ultraviolet(UV) physics within. Besides, using techniques from amplitudes, we calculate the bending angle of massless projectiles, including graviton, when they pass near a massive object, like the sun, which is represented by a massive scalar. This reveals the long-distance/infrared(IR) properties of quantum gravity, without worrying about the UV details. And we obtain different bending angles for different massless projectile with different spins, which could possibly indicate a violation of classical equivalence principle at quantum level.

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Lecture / Discussion Wed, 27 Nov 2019 13:50:43 -0500 2019-12-06T15:00:00-05:00 2019-12-06T16:00:00-05:00 West Hall Leinweber Center for Theoretical Physics Lecture / Discussion West Hall
Saturday Morning Physics | Black Holes: Facts, Myths and Mysteries (December 7, 2019 10:30am) https://events.umich.edu/event/66291 66291-16725808@events.umich.edu Event Begins: Saturday, December 7, 2019 10:30am
Location: Weiser Hall
Organized By: Saturday Morning Physics

This talk will be a journey through the concept of astrophysical black holes: from Einstein's theory to the discovery of the first stellar mass black hole in our Galaxy, all the way to the four- million-solar-mass black hole that is hiding at its center.

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Workshop / Seminar Wed, 04 Sep 2019 10:31:07 -0400 2019-12-07T10:30:00-05:00 2019-12-07T11:30:00-05:00 Weiser Hall Saturday Morning Physics Workshop / Seminar Black Hole from Event Horizon Telescope
Quantitative Biology Seminar | Morphogen Dynamics Control Patterning in a Stem Cell Model of the Human Embryo (December 9, 2019 12:00pm) https://events.umich.edu/event/68969 68969-17205310@events.umich.edu Event Begins: Monday, December 9, 2019 12:00pm
Location: West Hall
Organized By: Department of Physics

During embryonic development, diffusible signaling molecules called morphogens are thought to determine cell fates in a concentration-dependent manner, and protocols for directed stem cell differentiation are based on this picture. However, in the mammalian embryo, morphogen concentrations change rapidly compared to the time for making cell fate decisions. It is unknown how changing ligand levels are interpreted, and whether the precise timecourse of ligand exposure plays a role in cell fate decisions. In this talk I will discuss our work to address this question using human embryonic stem cells (hESCs), focusing on the dynamics of two morphogens that are crucial for vertebrate gastrulation: Nodal and BMP4. We showed that the response of hESCs to BMP4 signaling is indeed is determined by the ligand concentration, but that unexpectedly, the expression of many mesodermal targets of Nodal depends on the rate of concentration increase. In addition, we showed that a stem cell model for the human embryo generates a wave of Nodal signaling with cells experiencing rapidly increasing Nodal specifically in the region of mesendoderm differentiation. The BMP4 and Nodal pathways share the signal transducer Smad4. Using live imaging of hESCs with GFP integrated at the endogenous SMAD4 locus combined with Fluorescence Recovery After Photobleaching (FRAP), we demonstrated that response to rate of Activin change is due to adaptive signaling, which relies on sequestration of SMAD4. We also demonstrated that pulsatile stimulation with Activin induces repeated strong signaling and enhances mesoderm differentiation. Our results break with the paradigm of concentration-dependent differentiation and demonstrate an important role for morphogen dynamics in the cell fate decisions associated with mammalian gastrulation. They suggest a highly dynamic picture of embryonic patterning where some cell fates depend on rapid concentration increase rather than on absolute levels, and point to ligand dynamics as a new dimension to optimize protocols for directed stem cell differentiation.

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Workshop / Seminar Mon, 09 Dec 2019 18:16:12 -0500 2019-12-09T12:00:00-05:00 2019-12-09T13:00:00-05:00 West Hall Department of Physics Workshop / Seminar West Hall
Medical School Inside Story (December 9, 2019 5:00pm) https://events.umich.edu/event/65982 65982-16678385@events.umich.edu Event Begins: Monday, December 9, 2019 5:00pm
Location: University Hospitals
Organized By: Science Learning Center

Do you have questions about medical school admissions? Get your answers straight from the inside! U-M Medical School Admissions Director Carol Teener will demystify medical school applications, expectations, and reviews in her presentation.

Please submit your questions via the following link: https://forms.gle/49SpHo8WZLLfuUuR8 by Monday, December 2 and Director Teener will answer as many commonly-asked questions as possible in the allotted hour.

This session will take place in the University of Michigan Hospital's Ford Auditorium.
We recommend that you leave yourself extra time to find the auditorium if you have not been there before!

Registration Link: http://ttc.iss.lsa.umich.edu/undergrad/sessions/medical-school-inside-story-2/

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Workshop / Seminar Wed, 04 Sep 2019 15:41:30 -0400 2019-12-09T17:00:00-05:00 2019-12-09T18:00:00-05:00 University Hospitals Science Learning Center Workshop / Seminar
Complex Systems presents: A Nobel Symposium 2019 (December 10, 2019 1:00pm) https://events.umich.edu/event/69228 69228-17269240@events.umich.edu Event Begins: Tuesday, December 10, 2019 1:00pm
Location: Weiser Hall
Organized By: The Center for the Study of Complex Systems

Eight scholars discuss the work, impact, and personality of the Laureates of this year's SEVEN! Nobel Prizes. (Snacks and coffee will be provided throughout the afternoon)

FREE AND OPEN TO THE PUBLIC – STUDENTS ENCOURAGED TO ATTEND - TALKS ARE GEARED TO A GENERAL AUDIENCE - COME TO ONE, COME TO ALL

SCHEDULE:
1:00-1:05pm INTRODUCTION
1:05-1:40pm CHEMISTRY
1:40-2:15pm PHYSICS
2:15-2:20pm 5 minute snack/coffee break
2:20-2:55pm MEDICINE
2:55-3:35pm ECONOMIC SCIENCES
3:35-4:15pm PEACE PRIZE
4:15-4:20pm 5 minute snack/coffee break
4:20-4:55pm LITERATURE 2018
4:55-5:30pm LITERATURE 2019


1:05 PM CHEMISTRY – Wei Lu, Director, ABCD Battery Research Center and Professor, Mechanical Engineering will discuss the Chemistry prize shared by: John Goodenough (b. Germany, University of Texas (Austin)); M. Stanley Whittingham (b. UK, Binghamton University, State University of New York); and Akira Yoshino (b. Japan, Asahi Kasei Corporation, Tokyo) in recognition of their work "for the development of lithium-ion batteries”

1:40 PM PHYSICS - Fred Adams, Professor of Physics and Astronomy, will discuss the Physics prize shared by James Peebles (b. Canada, Princeton) “for theoretical discoveries in physical cosmology”
and Michel Mayor (b. Switzerland, U. of Geneva), Didier Queloz (b. Switzerland U. of Geneva & Cambridge) for “the discovery of an exoplanet orbiting a solar-type star.”

2:20 PM MEDICINE - Yatrik Shah, Professor, Molecular and Integrative Physiology & Internal Medicine - Gastroenterology will discuss the Medicine prize shared by William G. Kaelin Jr. (b. USA, Harvard Medical School &, Howard Hughes Medical Institute); Sir Peter J. Ratcliffe (b. UK, Oxford; Francis Crick Institute) and Gregg L. Semenza (b. USA, Johns Hopkins University) “for their discoveries of how cells sense and adapt to oxygen availability.”

2:55 PM ECONOMIC SCIENCES - Dean Yang, Professor Economics, Public Policy; Pop. Studies Center, will discuss the Economics prize shared by Abhijit Banerjee (b. Inida, MIT); Esther Duflo (b. FRANCE, MIT); and Michael Kremer (b. USA (NY), Harvard) “for their experimental approach to alleviating global poverty.”

3:35 PM PEACE - Laura Nyantung Beny - Professor of Law, Associate Director of African Studies Center, UM, will discuss the award to Abiy Ahmed Ali (b. Ethiopia, Prime Minister FDRE) who received the prize “for promoting peace and reconciliation”.

4:20 PM LITERATURE 2018 – Benjamin Paloff, Professor of Slavic Languages and Literatures & of Comparative Literature will discuss the award of the delayed 2018 Literature prize - Olga Tokarczuk (b. POLAND, Author) "for a narrative imagination that with encyclopedic passion represents the crossing of boundaries as a form of life."

4:55 PM LITERATURE 2019 - Johannes von Moltke, Professor of Germanic Languages and Literatures & Professor of Film, Television and Media together with Teresa Kovacs, Professor of Germanic Studies, Indiana University will discuss laureate Peter Handke (b. POLAND, Author) who was awarded the prize "for an influential work that with linguistic ingenuity has explored the periphery and the specificity of human experience"

Each presentation will be 30 minutes followed by a Q & A.

Illustrations of Nobel Peace Prize Winners reprinted with permission of the illustration artist Niklas Elmehed. Copyright Nobel Media.

Organizer: Robert Deegan

Questions? Call 734-763-3301 or email cscs@umich.edu

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Conference / Symposium Mon, 25 Nov 2019 16:58:48 -0500 2019-12-10T13:00:00-05:00 2019-12-10T17:30:00-05:00 Weiser Hall The Center for the Study of Complex Systems Conference / Symposium Nobel Symposium 2019
HET Brown Bag | The Inconsistency of Superfluid Dark Matter with Milky Way Dynamics (December 11, 2019 12:00pm) https://events.umich.edu/event/69885 69885-17482923@events.umich.edu Event Begins: Wednesday, December 11, 2019 12:00pm
Location: Randall Laboratory
Organized By: Leinweber Center for Theoretical Physics

There are many well-known correlations between dark matter and baryons that exist on galactic scales. These correlations can essentially be encompassed by a simple scaling relation between observed and baryonic accelerations, historically known as the Mass Discrepancy Acceleration Relation (MDAR). The existence of such a relation has prompted many theories that attempt to explain the correlations by invoking additional fundamental forces on baryons. The standard lore has been that a theory that reduces to the MDAR on galaxy scales but behaves like cold dark matter (CDM) on larger scales provides an excellent fit to data, since CDM is desirable on scales of clusters and above. However, this statement should be revised in light of recent results showing that a fundamental force that reproduces the MDAR is challenged by Milky Way dynamics. In this study, we test this claim on the example of Superfluid Dark Matter. We find that a standard CDM model is strongly preferred over a static superfluid profile. This is due to the fact that the superfluid model over-predicts vertical accelerations, even while reproducing galactic rotation curves. Our results establish an important criterion that any dark matter model must satisfy within the Milky Way.

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Lecture / Discussion Thu, 12 Dec 2019 09:56:29 -0500 2019-12-11T12:00:00-05:00 2019-12-11T13:00:00-05:00 Randall Laboratory Leinweber Center for Theoretical Physics Lecture / Discussion Randall Laboratory
Saturday Morning Physics | Climate Change Opportunities and Challenges for Michigan (December 14, 2019 10:30am) https://events.umich.edu/event/66293 66293-16725810@events.umich.edu Event Begins: Saturday, December 14, 2019 10:30am
Location: Weiser Hall
Organized By: Saturday Morning Physics

Climate change is already impacting the planet in dramatic ways, including in the U.S. and in the Great Lakes region. The impacts in Michigan, although not negligible, are modest compared to much of the country, and thus our state could become a go-to destination for many businesses and people fleeing more severe climate change impacts in other parts of the country. However, if climate change is not curbed, Michigan also runs the risk of becoming a sacrifice zone; thus quick action on climate change could be a win-win for our state.

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Workshop / Seminar Wed, 04 Sep 2019 10:38:06 -0400 2019-12-14T10:30:00-05:00 2019-12-14T11:30:00-05:00 Weiser Hall Saturday Morning Physics Workshop / Seminar Flooding in Dearborn Spring 2019
Biosciences Initiative Second Annual Community Celebration and Symposium with President Schlissel (December 16, 2019 4:30pm) https://events.umich.edu/event/69140 69140-17252904@events.umich.edu Event Begins: Monday, December 16, 2019 4:30pm
Location: Michigan League
Organized By: Biosciences Initiative

Celebrating progress of the second year and introducing our 2019 Scientific Initiatives and Exploratory awardees.

The Biosciences Initiative is hosting its second annual community celebration, recognizing the progress of the second year and introducing its most recently awarded projects and groups.

Don't miss your opportunity to learn about these exciting proposals and connect with President Schlissel and fellow members of the biosciences community.

The Biosciences Initiative focuses on funding cutting-edge interdisciplinary research, expert faculty hires, and postgraduate education across the biological sciences at U-M.

Reception with free food and beverages will follow. RSVP to attend: https://docs.google.com/forms/d/e/1FAIpQLSeVAaOMh-bXpKiIfeMx5PQFEtjADiogJwEHlGkhVcfiiQGZ9w/viewform?usp=sf_link.

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Conference / Symposium Fri, 13 Dec 2019 12:30:00 -0500 2019-12-16T16:30:00-05:00 2019-12-16T18:30:00-05:00 Michigan League Biosciences Initiative Conference / Symposium bacteria and people graphic
CM Theory Seminar | Imaging Nematic Quantum Hall States and their Interacting Boundary Modes (January 9, 2020 4:00pm) https://events.umich.edu/event/70881 70881-17728770@events.umich.edu Event Begins: Thursday, January 9, 2020 4:00pm
Location: West Hall
Organized By: Department of Physics

Two-dimensional quantum Hall systems offer a versatile platform to explore the interplay between topology and symmetry breaking facilitated by Coulomb interactions. In this talk, I discuss the novel phenomena that arise from spontaneous valley ordering of bismuth surface states in a large magnetic field. Specifically, we observe the emergence of a nematic phase which breaks the rotational symmetry of the underlying crystal and a ferroelectric phase that carries an in-plane electric dipole moment. We use a scanning tunneling microscope to identify and directly image the wavefunctions of these broken-symmetry quantum Hall phases. Furthermore, we explore the boundary between distinct nematic domains, which host counter-propagating 1D modes. By changing the number of modes, we realize strikingly different regimes where the boundary is either metallic or insulating, constrained by Coulomb interactions between these 1D modes.

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Workshop / Seminar Thu, 09 Jan 2020 18:16:31 -0500 2020-01-09T16:00:00-05:00 2020-01-09T17:00:00-05:00 West Hall Department of Physics Workshop / Seminar West Hall
HET Seminar | Searching for Dark Matter Interactions in Cosmology (January 10, 2020 3:00pm) https://events.umich.edu/event/70973 70973-17760246@events.umich.edu Event Begins: Friday, January 10, 2020 3:00pm
Location: West Hall
Organized By: Leinweber Center for Theoretical Physics

There is a substantial effort in the physics community to search for dark matter interactions with the Standard Model of particle physics. Collisions between dark matter particles and baryons exchange heat and momentum in the early Universe, enabling a search for dark matter interactions using cosmological observations in a parameter space that is complementary to that of direct detection. In this talk, I will describe the effects of scattering in cosmology and show constraints using Planck 2015 data and SDSS-identified satellite galaxies of the Milky Way. I will also discuss the implications of late-time scattering during the era of Cosmic Dawn.

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Lecture / Discussion Mon, 06 Jan 2020 16:50:40 -0500 2020-01-10T15:00:00-05:00 2020-01-10T16:00:00-05:00 West Hall Leinweber Center for Theoretical Physics Lecture / Discussion West Hall
Special CM Theory Seminar | Photoinduced Transformation of Nanoscale Domains in Ferroelectric Complex Oxides (January 13, 2020 1:00pm) https://events.umich.edu/event/71126 71126-17779236@events.umich.edu Event Begins: Monday, January 13, 2020 1:00pm
Location: West Hall
Organized By: Department of Physics

Complex oxide materials are an intense and exciting research area of condensed matter physics with their coupling between lattice, charge, and spin. Especially, nanoscale periodic polar configurations in ferroic oxides called ferroelectric domains exhibit novel phenomena leading to an intense flurry of research interests. However, as studies of functional responses to external stimuli have mainly focused on electric and mechanical responses, a new and effective approach to manipulate these polar configurations is on demand. In this presentation, I will discuss our efforts to investigate interaction of light with nanoscale domains and ferroelastic domain walls examined by in-situ and time-resolved x-ray diffraction experiments. By tracking temporal evolution of x-ray domain diffuse scattering, we have found that structural transformation of ferroic domains is optically induced and exhibits nonthermal characteristics. I will also present theoretical considerations to investigate the underlying physics of the photoinduced transformation.

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Workshop / Seminar Mon, 13 Jan 2020 18:16:32 -0500 2020-01-13T13:00:00-05:00 2020-01-13T14:00:00-05:00 West Hall Department of Physics Workshop / Seminar West Hall
HEP-Astro Seminar | Next Generation of Dark Matter Direct Detection (January 13, 2020 4:00pm) https://events.umich.edu/event/70108 70108-17532707@events.umich.edu Event Begins: Monday, January 13, 2020 4:00pm
Location: Ross School of Business
Organized By: Department of Physics

The development of dark matter direct detection technologies, especially liquid xenon time projection chamber such as that used in the XENON1T experiment, has made rapid progress in the search for WIMP dark matter in the last decade. The upcoming XENONnT and LZ experiments will further improve the search sensitivity. Beyond that, a generation-3 (G3) dark matter detector will eventually reach the detection limits set by neutrinos. On the other hand, there are vast unexplored parameter space for light dark matter with mass below 1 GeV. In this talk, I will review the recent progress in dark matter direct detection experiments and discuss the promising new technologies that will lead the next generation experiments searching for both heavy and light dark matter particles.

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Workshop / Seminar Mon, 13 Jan 2020 18:16:31 -0500 2020-01-13T16:00:00-05:00 2020-01-13T17:00:00-05:00 Ross School of Business Department of Physics Workshop / Seminar Ross School of Business
HET Brown Bag | Effective field theory near and far from equilibrium (January 15, 2020 12:00pm) https://events.umich.edu/event/71081 71081-17774965@events.umich.edu Event Begins: Wednesday, January 15, 2020 12:00pm
Location: Randall Laboratory
Organized By: Leinweber Center for Theoretical Physics

I will discuss effective field theories for two classes of non-equilibrium systems, one far and one near equilibrium. In the first part I will present an effective response theory for topological driven (Floquet) systems, which are inherently far from equilibrium. As an example, I will discuss a topological chiral Floquet drive coupled to a background $U(1)$ field, which gives rise to a theta term in the effective action. In the second part, I will discuss an ongoing project using effective field theories for hydrodynamics. I will show that chiral diffusion for interacting systems in 1+1 dimensions, which may be relevant to edge transport in quantum Hall systems, has an infrared instability. I will then discuss the fate of this instability.

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Lecture / Discussion Tue, 21 Jan 2020 15:25:14 -0500 2020-01-15T12:00:00-05:00 2020-01-15T13:00:00-05:00 Randall Laboratory Leinweber Center for Theoretical Physics Lecture / Discussion Randall Laboratory
DCMB Weekly Seminar (January 15, 2020 4:00pm) https://events.umich.edu/event/70964 70964-17760238@events.umich.edu Event Begins: Wednesday, January 15, 2020 4:00pm
Location: Palmer Commons
Organized By: DCMB Seminar Series

Abstract: Synchronization occurs all around us. It underlies how fireflies flash as one, how human heart cells beat in unison, and how superconductors conduct electricity with no resistance. Synchronization is present in the precision of the cell cycle, and we can explore how breakdown of precision leads to disease. The many unique and fundamental functions of different cell types are achieved over and over independently, through a form of synchronization involving choreography of many proteins and genes. I will share a general historic and descriptive introduction to synchrony, including the classic work of Alan Turing. I will present some new work done jointly with Cleve Moler (MathWorks) and Steve Smale (UC Berkeley), where biology has inspired us to build new mathematical techniques to explore synchrony and its breakdown.

BlueJeans Livestream: https://primetime.bluejeans.com/a2m/live-event/rbuvycdc

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Lecture / Discussion Mon, 06 Jan 2020 15:39:08 -0500 2020-01-15T16:00:00-05:00 2020-01-15T17:00:00-05:00 Palmer Commons DCMB Seminar Series Lecture / Discussion
MLK Day Department Colloquium | Creating our Future: Attracting and Retaining the Best Students from All Backgrounds (January 15, 2020 4:00pm) https://events.umich.edu/event/71015 71015-17768616@events.umich.edu Event Begins: Wednesday, January 15, 2020 4:00pm
Location: West Hall
Organized By: Department of Physics

Physics now must compete for the best and brightest. How do we collectively locate, nurture, and advance students who will become our colleagues regardless of opportunities they may or may not have had as they began their studies? There is good evidence that strategies used to attract us into the field are missing large numbers of capable and eager students. I will discuss programs and new approaches that are opening the door to students who may not have felt welcome in the past, but who are now bringing their insights and hard work to solving the next generation of physics problems. We will discuss how the Michigan physics department can help with and benefit from these programs.

This is an inaugural MLK Day Department Colloquium.

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Workshop / Seminar Wed, 15 Jan 2020 18:16:44 -0500 2020-01-15T16:00:00-05:00 2020-01-15T17:00:00-05:00 West Hall Department of Physics Workshop / Seminar West Hall
Being Human in STEM: An Experiment in Partnering with Students to Address Issues of Equity in STEM (January 16, 2020 12:00pm) https://events.umich.edu/event/69259 69259-17275351@events.umich.edu Event Begins: Thursday, January 16, 2020 12:00pm
Location: Rackham Graduate School (Horace H.)
Organized By: LSA Biophysics

When student protesters occupied the Amherst College library for four days in November of 2015, the campus community was transfixed by the painful testimonials shared by marginalized students about their experiences at Amherst as individuals identifying as Black, brown, female, queer, trans, disabled, international, among others. In response to letters from a Black neuroscience major and a non-binary biochemistry and biophysics major, every STEM department wrote a letter of support, pledging to work with students to address their concerns. The following semester, Chemistry professor Sheila Jaswal collaborated with students to develop a project-based course, titled “Being Human in STEM” (HSTEM), to actively engage STEM students and departments in learning about and enhancing inclusion in STEM settings. Now in its sixth iteration, students drive the academic inquiry, investigating both the local experience and the literature on diversity in STEM. They then use that research to design tools and interventions to share with and enhance their own STEM community.  In this seminar, Professor Jaswal will describe how HSTEM course projects and activities have continued the conversation started by students during the Uprising, connected STEM inclusion efforts across the Amherst campus, and produced resources such as the “Inclusive Curricular Practices” handbook, that have been used by STEM educators from high schools, colleges, universities, and the Howard Hughes Medical Institute Inclusive Excellence institutions. She will present evidence on the impact of the HSTEM course and practices on students, faculty and staff at Amherst, and provide examples of how a growing network of institutions, including Yale, Brown, Williams, and the University of Utah, are adapting the HSTEM model to their own STEM community needs. 

Please visit website for more information on speaker: http://www.beinghumaninstem.com/sheila-jaswal.html

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Workshop / Seminar Wed, 08 Jan 2020 12:58:03 -0500 2020-01-16T12:00:00-05:00 2020-01-16T14:00:00-05:00 Rackham Graduate School (Horace H.) LSA Biophysics Workshop / Seminar Rackham Graduate School (Horace H.)
Electronics in the Brain – Literally (January 17, 2020 1:00pm) https://events.umich.edu/event/71584 71584-17842691@events.umich.edu Event Begins: Friday, January 17, 2020 1:00pm
Location: Gerald Ford Library
Organized By: Electrical and Computer Engineering

Abstract

Reading the human mind by electronic means used to be the domain of science fiction – and is still largely so. At the same time, technologies collectively labelled as brain-computer interfaces have moved forward, motivated by needs for assistive tools for neurologically impaired people and to advance our fundamental understanding of the brain. An applied example would be the use of electronic means to read out directly from the brain the intention to move an arm or a hand, and to decipher such signals to actuate an external robotic device. Another example is the
reading out brain signals produced when listening to or formulating speech. To access brain’s microcircuits at high space-time resolution requires implantation of electronic listening posts, call them nodes, at a number of nearby locations in a given functional area of the cortex. Which brings up the question of the day for neuroengineers: how many nodes might be required or are possible to implant, and how does one physically implement arrays of microscale electronic probes? What are the data rates involved in extracting brain signals and how to design a communication link to send the data onward for decoding by external computing platforms? What about reversing the direction of the process to use implanted probes to deliver signals directly into the brain (‘write-in’)? Through contemporary examples, this presentation will review recent accomplishments in the field from an electrical engineer’s viewpoint and discuss both the challenges and opportunities ahead to build next generations of brain-computer interfaces while explicitly exploiting many of the early 21st century advances in microelectronics, telecommunication, and high end computing.

Bio

Arto V. Nurmikko, a native of Finland, is a L. Herbert Ballou University Professor of Engineering and Physics at Brown. He received his degrees from University of California, Berkeley, with postdoctoral stays at MIT and Hebrew University. Professor Nurmikko conducts research in neuroengineering, brain sciences, nanophotonics and microelectronics, especially for the translation of device research to new technologies in biomedical, life science, and photonics applications. His current interests include development of implantable brain communication interfaces, microscale neural circuit sensors, compact semiconductor lasers, and high resolution acoustic microscopy. Professor Nurmikko is a Fellow of the American Physical Society, Fellow of the Institute of Electrical and Electronics Engineers, and Fellow of the Optical Society of America. He has been the recipient of a Guggenheim Fellowship, and elected to the American Academy of Arts and Sciences and to the Academy of Letters and Science of Finland. He was the co-recipient of the Israel Brain Prize in 2013.

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Lecture / Discussion Thu, 16 Jan 2020 11:10:47 -0500 2020-01-17T13:00:00-05:00 2020-01-17T14:30:00-05:00 Gerald Ford Library Electrical and Computer Engineering Lecture / Discussion Gerald Ford Library
Understanding Complexity (January 21, 2020 1:00pm) https://events.umich.edu/event/70492 70492-17600719@events.umich.edu Event Begins: Tuesday, January 21, 2020 1:00pm
Location: Off Campus Location
Organized By: Osher Lifelong Learning Institute (50+)

The course will cover complexity science, introducing the core concepts and discussing ideas such as emergence, using twelve DVD lectures from the Teaching Company by University of Michigan Professor Scott Page. We’ll view two 30-minute lectures per class, each followed by 20 minutes for questions and discussion. The study group leader worked 27 years as a research physicist for Ford and taught physics at several levels, including graduate level at Wayne State University. At OLLI, he has taught 16 physics-related classes. The Study Group for those 50 and over led by Richard Chase is held Tuesdays January 21 through February 25.

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Class / Instruction Wed, 18 Dec 2019 11:55:36 -0500 2020-01-21T13:00:00-05:00 2020-01-21T15:00:00-05:00 Off Campus Location Osher Lifelong Learning Institute (50+) Class / Instruction Study Group
CM-AMO Seminar | Probes of Novel Electronic States in Mesoscopic and 2D Quantum Materials (January 21, 2020 4:00pm) https://events.umich.edu/event/71240 71240-17794027@events.umich.edu Event Begins: Tuesday, January 21, 2020 4:00pm
Location: West Hall
Organized By: Department of Physics

Recent advances in the development of exfoliated 2D materials and other mesoscopic systems (e.g. semiconducting nanowires) have led to the discovery of intriguing topological, magnetic, and superconducting states. However, many bulk probes which have been invaluable in understanding complex electronic states such as those found in high-temperature superconductors are no longer applicable. Additionally, many scanned probes which can study physics on the nanoscale are incompatible with the highest quality, state-of-the-art 2D materials-based devices which rely on encapsulation with hexagonal boron nitride. In this talk I will present magnetic imaging studies of more traditional mesoscopic systems, including imaging current distributions in micron-scale devices and studying novel nanowire-based superconducting devices. Secondly, I will describe more recent work realizing low-disorder graphene devices which facilitated the discovery of new topological states of matter. Finally, I will discuss prospects for studying 2D materials both with magnetic imaging and on-chip THz spectroscopy using superconductivity in exfoliated flakes as an example.

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Workshop / Seminar Tue, 21 Jan 2020 18:17:05 -0500 2020-01-21T16:00:00-05:00 2020-01-21T17:00:00-05:00 West Hall Department of Physics Workshop / Seminar West Hall
Department Colloquium | Nuclear Physics from the Standard Model (January 22, 2020 4:00pm) https://events.umich.edu/event/70952 70952-17760228@events.umich.edu Event Begins: Wednesday, January 22, 2020 4:00pm
Location: West Hall
Organized By: Department of Physics

I will discuss the status and future of calculations of nuclei based on the Standard Model of particle physics. With advances in supercomputing, we are beginning to quantitatively understand nuclear structure and interactions directly from the fundamental quark and gluon degrees of freedom. Recent studies provide insight into the neutrino-nucleus interactions relevant to long-baseline neutrino experiments, double beta decay, and theory predictions of dark matter cross-sections at underground detectors. I will also address new work constraining the gluonic structure of nuclei, which will be measurable for the first time at a future electron-ion collider, and explain how machine learning tools are providing new possibilities in this field.

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Workshop / Seminar Wed, 22 Jan 2020 18:16:59 -0500 2020-01-22T16:00:00-05:00 2020-01-22T17:00:00-05:00 West Hall Department of Physics Workshop / Seminar West Hall
Growth and Grit - Developing a Mindset For Success (January 22, 2020 5:30pm) https://events.umich.edu/event/70897 70897-17735191@events.umich.edu Event Begins: Wednesday, January 22, 2020 5:30pm
Location: Undergraduate Science Building
Organized By: Science Learning Center

What if your ability to succeed in your classes was determined in part before you even stepped into the classroom? What is the one quality you need to overcome adversity academically and in life? This workshop will detail the research of Dr. Carol Dweck and her groundbreaking work on the concept of mindset. Students will learn how to abandon a debilitating fixed mindset in favor of a growth mindset, leading to success in areas they once considered too difficult. The workshop will also introduce students to the research of Dr. Angela Duckworth, and how a growth mindset can lead to the development of grit, an essential characteristic to overcoming our fear of failure.

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Workshop / Seminar Wed, 15 Jan 2020 10:16:28 -0500 2020-01-22T17:30:00-05:00 2020-01-22T19:00:00-05:00 Undergraduate Science Building Science Learning Center Workshop / Seminar
Exploring Pluto and Beyond (January 23, 2020 6:30pm) https://events.umich.edu/event/71483 71483-17834193@events.umich.edu Event Begins: Thursday, January 23, 2020 6:30pm
Location: GG Brown Laboratory
Organized By: American Institute of Aeronautics and Astronautics

Alice Bowman, of the Johns Hopkins University Applied Physics Laboratory and New Horizons Mission Operations Manager (MOM), talks about the voyage of NASA’s historic mission to Pluto and the Kuiper Belt– which culminated with the first flight past the distant dwarf planet on July 14, 2015 and the first encounter with a Kuiper Belt object (KBO) on January 1, 2019.

She’ll speak about this continuing journey through the eyes of the APL mission operations team and describe some of the technical, scientific, and personal challenges of piloting the New Horizons spacecraft across the solar system on its voyage to the farthest reaches of the planetary frontier.

Food and beverages will be provided.

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Lecture / Discussion Wed, 15 Jan 2020 14:30:58 -0500 2020-01-23T18:30:00-05:00 2020-01-23T20:00:00-05:00 GG Brown Laboratory American Institute of Aeronautics and Astronautics Lecture / Discussion Alice Bowman, Johns Hopkins Applied Physics Lab, New Horizons Mission Operations Manager
Supporting Students and Colleagues with Mental Health Challenges, a Practical Workshop (January 24, 2020 11:00am) https://events.umich.edu/event/71744 71744-17877259@events.umich.edu Event Begins: Friday, January 24, 2020 11:00am
Location: West Hall
Organized By: Physics Workshops & Conferences

Based on faculty interest, the Physics DEI committee is sponsoring an interactive workshop focused on practical strategies for supporting students and colleagues who may be experiencing mental health challenges. Refreshments will be served.

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Workshop / Seminar Mon, 20 Jan 2020 10:50:17 -0500 2020-01-24T11:00:00-05:00 2020-01-24T12:00:00-05:00 West Hall Physics Workshops & Conferences Workshop / Seminar West Hall
HET Seminar | Bit threads and holographic monogamy (January 24, 2020 3:00pm) https://events.umich.edu/event/71113 71113-17777078@events.umich.edu Event Begins: Friday, January 24, 2020 3:00pm
Location: West Hall
Organized By: Leinweber Center for Theoretical Physics

Entanglement entropies are well-studied in holographic field theories thanks to the Ryu-Takayanagi formula. Bit threads offer a conceptually and technically powerful new way to think about this formula. In this talk, after introducing bit threads, I will use them to give a new understanding of the so-called monogamy property of holographic entropies. The resulting picture will lead to an intriguing conjecture about the general entanglement structure of holographic states.

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Lecture / Discussion Wed, 08 Jan 2020 14:28:52 -0500 2020-01-24T15:00:00-05:00 2020-01-24T16:00:00-05:00 West Hall Leinweber Center for Theoretical Physics Lecture / Discussion West Hall
HEP-Astro Seminar | New Result on K+→π+vv^- from the NA62 Experiment (January 27, 2020 4:00pm) https://events.umich.edu/event/71101 71101-17777061@events.umich.edu Event Begins: Monday, January 27, 2020 4:00pm
Location: West Hall
Organized By: Department of Physics

The decay K+→π+vv^-, with a very precisely predicted branching ratio of less than 10exp(-10), is one of the best candidates to reveal indirect effects of new physics at the highest mass scales. The NA62 experiment at the CERN SPS is designed to measure the branching ratio of the K+ → π+vv^- with a decay-in-flight technique. NA62 took data so far in 2016-2018. Statistics collected in 2016 allowed NA62 to reach the Standard Model sensitivity for K+→π+vv^- entering the domain of 10exp(-10) single event sensitivity and showing the proof of principle of the experiment. Thanks to the statistics collected in 2017, NA62 surpasses the present best sensitivity. The analysis strategy is reviewed and the preliminary result from the 2017 data set is presented.

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Workshop / Seminar Mon, 27 Jan 2020 18:17:00 -0500 2020-01-27T16:00:00-05:00 2020-01-27T17:00:00-05:00 West Hall Department of Physics Workshop / Seminar West Hall
Special HEP-Astro Seminar | When Stars Go Nonlinear: Large Amplitude Tides and Stellar Oscillations (January 28, 2020 2:00pm) https://events.umich.edu/event/71215 71215-17787739@events.umich.edu Event Begins: Tuesday, January 28, 2020 2:00pm
Location: West Hall
Organized By: Department of Physics

Tides significantly impact the structure, evolution, and fate of many types of close binary systems, including short-period exoplanets, stellar binaries, and coalescing binary neutron stars. In many of these systems, the tide’s amplitude is so large that it cannot be treated as a small, linear perturbation to the background star. In this talk, I will show that nonlinear effects can greatly enhance the rate of tidal dissipation and thus the rate of binary evolution. As examples, I will describe how nonlinear tides influence the orbital decay of hot Jupiters and the gravitational-wave signal of coalescing binary neutron stars and white dwarfs. I will also discuss the nonlinearity of oscillation-modes in solar-like stars, which are excited by turbulent motions within the convective envelope. The rich oscillation spectra observed by space missions such as Kepler and TESS has revolutionized the field of asteroseismology and yielded a wealth of information about the internal and global properties of thousands of stars.

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Workshop / Seminar Tue, 28 Jan 2020 18:16:58 -0500 2020-01-28T14:00:00-05:00 2020-01-28T15:00:00-05:00 West Hall Department of Physics Workshop / Seminar West Hall
HET Brown Bag | Statistical inference of dark matter substructure with weak and strong gravitational lensing (January 29, 2020 12:00pm) https://events.umich.edu/event/71096 71096-17777057@events.umich.edu Event Begins: Wednesday, January 29, 2020 12:00pm
Location: Randall Laboratory
Organized By: Leinweber Center for Theoretical Physics

Dark matter structures are expected to exist over a large range of scales, and their properties and distribution can strongly correlate with the underlying particle physics. In this talk, I will describe two separate methods to statistically infer the properties of dark matter substructure using (astrometric)-weak and strong lensing observations, respectively. In the first part of the talk, I will describe how the motion of subhalos in the Milky Way induces a correlated pattern of motions in background celestial objects---known as astrometric weak lensing---and how global signatures of these correlations can be measured using the vector spherical harmonic decomposition formalism. These measurement can be used to statistically infer the nature of substructure, and I will show how this can be practically achieved with future astrometric surveys and/or radio telescopes such as WFIRST and the Square Kilometer Array. Next, I will describe a novel method to disentangle the collective imprint of dark matter substructure on extended arcs in galaxy-galaxy strong lensing systems using likelihood-free (or simulation-based) inference techniques. This method uses neural networks to directly estimate the likelihood ratios associated with population-level parameters characterizing substructure within lensing systems. I will show how this method can provide an efficient and principled way to mine the large sample of strong lenses that will be imaged by future surveys like LSST and Euclid to look for signatures of dark matter substructure. I will emphasize how the statistical inference of substructure using these techniques can be used to stress-test the Cold Dark Matter paradigm and probe alternative scenarios such as scalar field dark matter and enhanced primordial fluctuations.

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Lecture / Discussion Thu, 30 Jan 2020 14:11:30 -0500 2020-01-29T12:00:00-05:00 2020-01-29T13:00:00-05:00 Randall Laboratory Leinweber Center for Theoretical Physics Lecture / Discussion Randall Laboratory
HET Seminar | Spacetime fluctuations in AdS/CFT (and experiment) (January 29, 2020 2:30pm) https://events.umich.edu/event/71579 71579-17842686@events.umich.edu Event Begins: Wednesday, January 29, 2020 2:30pm
Location: Randall Laboratory
Organized By: Leinweber Center for Theoretical Physics

Please note special time and location:
Wednesday 29th January, 2:30 - 3:30
3481 Randall Lab

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Lecture / Discussion Fri, 17 Jan 2020 13:25:41 -0500 2020-01-29T14:30:00-05:00 2020-01-29T15:30:00-05:00 Randall Laboratory Leinweber Center for Theoretical Physics Lecture / Discussion Randall Laboratory
DCMB Seminar Series (January 29, 2020 4:00pm) https://events.umich.edu/event/71998 71998-17911963@events.umich.edu Event Begins: Wednesday, January 29, 2020 4:00pm
Location: Palmer Commons
Organized By: DCMB Seminar Series

Talk Title: Experimental and computational strategies to aid compound identification and quantitation in metabolomics

Abstract: Over the past two decades, metabolomics as a technique has moved from the primary domain of analytical chemists to more widespread acceptance by biologists, clinicians and bioinformaticians alike. Metabolomics offers systems-level insights into the critical roles small molecules play in routine cellular processes and myriad disease states. However, certain unique analytical challenges remain prominent in metabolomics as compared to the other ‘omics sciences. These include the difficulty of identifying unknown features in untargeted metabolomics data, and challenges maintaining reliable quantitation within lengthy studies that may span multiple laboratories. Unlike genomics and transcriptomics data in which nearly every quantifiable feature is confidently identified as a matter of course, in typical untargeted metabolomics studies over 80% of features are frequently not mapped to a specific chemical compound. Further, although many metabolomics studies have begun to stretch over a timeframe of years, data quantitation and normalization strategies have not always kept up with the requirements for such large studies. Fortunately, both experimental and computational strategies are emerging to tackle these long-standing challenges. We will report on several techniques in development in our laboratory, ranging from chromatographic fractionation and high-sensitivity data acquisition, to computational strategies to aid in tandem mass spectrometric spectral interpretation. These developments serve to facilitate analysis for both experts and novice users, which should ultimately help improve the biological insight and impact gained from metabolomics data.

BlueJeans livestreaming link: https://primetime.bluejeans.com/a2m/live-event/rbuvycdc

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Lecture / Discussion Fri, 24 Jan 2020 11:07:13 -0500 2020-01-29T16:00:00-05:00 2020-01-29T17:00:00-05:00 Palmer Commons DCMB Seminar Series Lecture / Discussion
Department Colloquium | New Ideas in Dark Matter Detection (January 29, 2020 4:00pm) https://events.umich.edu/event/71102 71102-17777062@events.umich.edu Event Begins: Wednesday, January 29, 2020 4:00pm
Location: West Hall
Organized By: Department of Physics

The nature of the dark matter remains one of the most compelling outstanding questions in physics. Theoretical and experimental focus has been directed in the last several decades on New Physics at the weak scale, including the search for dark matter as a Weakly Interacting Massive Particle (WIMP). We are now looking beyond the WIMP window towards light hidden sectors, and new ideas to search for dark matter must be found. I describe some of these new ideas, including collective excitations in polar materials and superfluid helium, as well as low-gap targets like Dirac semimetals.

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Workshop / Seminar Wed, 29 Jan 2020 18:17:10 -0500 2020-01-29T16:00:00-05:00 2020-01-29T17:00:00-05:00 West Hall Department of Physics Workshop / Seminar West Hall
Make It Stick - Research-Based Learning Strategies You Need to Know (January 29, 2020 5:30pm) https://events.umich.edu/event/70899 70899-17735192@events.umich.edu Event Begins: Wednesday, January 29, 2020 5:30pm
Location: Undergraduate Science Building
Organized By: Science Learning Center

The study and learning strategies students often bring to college are often insufficient to help them succeed at the university level. Particularly in challenging STEM courses, students can't simply memorize or cram their way to a good grade. This workshop will focus on the popular learning strategies to avoid, as well as the top three strategies you don't know but are shown by research to be the most effective for long-term learning.

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Workshop / Seminar Wed, 15 Jan 2020 10:18:11 -0500 2020-01-29T17:30:00-05:00 2020-01-29T19:00:00-05:00 Undergraduate Science Building Science Learning Center Workshop / Seminar make it stick by Brown, Roediger III, and McDaniel
NERS Colloquium: Medical Imaging Advances: Do All Bell-and-Whistle Options Impact Patient Care? (January 31, 2020 4:00pm) https://events.umich.edu/event/70139 70139-17540914@events.umich.edu Event Begins: Friday, January 31, 2020 4:00pm
Location: Cooley Building
Organized By: Nuclear Engineering and Radiological Sciences

Learn about the development of Computed Tomography from its inception in the early 1970s to the present; the medical applications of CT (e.g., diagnostic radiology, radiation oncology, and interventional CBCT); and the current state of how CT improvements are driven. The theme of the discussion will be to highlight the key technological advances that increased the value of CT in medicine. Examples of advancements with unquestionable benefit to patient care and other “advancements” with motivation rooted in unwarranted fear over radiation dose will be covered. This discussion will be presented in a manner suitable for the non-medical imaging expert to convey the larger themes related to technology advancement in the space of medical imaging.


Speaker: Timothy Szczykutowicz, University of Wisconsin School of Medicine and Public Health, Department of Medical Physics

Dr. Szczykutowicz is an assistant professor in the University of Wisconsin School of Medicine and Public Health Departments of Radiology, Medical Physics, and Biomedical Engineering. He received his Bachelors of Science in Physics from the SUNY University at Buffalo in 2008. He was active in medical physics at Buffalo in the laboratory of Dr. Stephen Rudin with the Toshiba Stroke Research Center, working on vessel sizing and detector performance characterization. After his undergraduate studies, Dr. Szczykutowicz came to the University of Wisconsin–Madison where he earned his Masters and PhD in Medical Physics, receiving mentorship from Doctors Charles 'Chuck' Mistretta and Guang-Hong Chen. His dissertation was on fluence field modulated CT, a promising x-ray imaging technique that allows for imaging dose to be tailored to individuals. After his dissertation work, Dr. Szczykutowicz spent a year as a doctrinal fellow and imaging physics resident with the Department of Medical Physics at the UW before being appointed as a clinical health sciences Assistant Professor. The clinical and research activities of Dr. Szczykutowicz include: optimizing CT scan protocols, monitoring patient dose, developing new metrics to define image quality in the clinical setting, developing protocol management methodologies, fluence field modulated CT, dual energy CT, and assisting in various projects related to cone beam CT.

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Workshop / Seminar Tue, 14 Jan 2020 13:45:32 -0500 2020-01-31T16:00:00-05:00 2020-01-31T17:00:00-05:00 Cooley Building Nuclear Engineering and Radiological Sciences Workshop / Seminar Speaker: Timothy Szczykutowicz
HEP-Astro Seminar | Ultra-Low Energy Calibration of the LUX and LZ Dark Matter Detectors (February 3, 2020 4:00pm) https://events.umich.edu/event/71241 71241-17794028@events.umich.edu Event Begins: Monday, February 3, 2020 4:00pm
Location: West Hall
Organized By: Department of Physics

The Large Underground Xenon (LUX) experiment is a 250 kg active mass dual-phase time-projection chamber (TPC) operating at the 4850 ft level of the Sanford Underground Research Facility in Lead, SD. Various sources, including ^{127}Xe, D-D neutrons, ^{83}mKr, Tritium, and AmBe neutrons are used to perform calibrations of detector responses to electron recoils (ER) and nuclear recoils (NR). I will present an ultra-low energy calibration of ER using an intrinsic ^{127}Xe source and of NR using a short pulsed D-D neutron generator. Radioactive isotope ^{127}Xe is formed in the LUX LXe volume due to cosmogenic activation before the detector was moved one mile underground. A measurement in the early stage of the LUX WS2013 science run unveils ~0.9 million ^{127}Xe atoms in the LUX LXe volume, which provides an ideal source for low energy calibrations. ^{127}Xe decay is a form of electron capture in which a high energy gamma (> 200 keV) is emitted, followed by an associated low energy X-ray cascade over the energy range of 190 eV to 33.2 keV. The relatively long mean free path (mfp) of the gamma-ray (> 0.9 cm) allows the EC decay to produce clearly identified 2-vertex events in the LUX detector. We observe the K (33.2 keV), L (5.2 keV), M (1.1 keV), and N (190 eV) shell cascade events and verify the relative ratio of observed events for each shell. We extract the means and sigmas of the charge signal yields associated with the K, L, M, and N shell events. The N shell cascade analysis includes single extracted electron (SE) events and represents the lowest-energy electronic recoil in situ measurements that have been explored in liquid xenon. A short pulsed D-D neutron NR calibration was performed in situ in the LUX detector in June 2016 after the completion of the LUX WS2013-16 science run. The calibration incorporates a pulsing technique with narrow pulses (20 us / 250 Hz). We have measured, with low systematics, the absolute rates of NR events with ionization signals down to 2 extracted electrons and zero, one or greater detected scintillation photons. A calibration measurement with absolute event rates of charge-only S2 events for the first time in a Xe TPC provides an important probe for ultra-low energy measurements of LXe Qy. This technique provides direct measurements of scintillation and charge yields down to (Ly) 0.45 keVnr and (Qy) 0.27 keVnr, respectively. New calibration results on ultra-low energy nuclear recoil yields are crucial to determine physics search sensitivities for large mass LXe TPCs (LZ experiment) for low mass WIMPs (< 10 GeV) and for coherent neutrino scattering (e.g. ^8B solar neutrino).

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Workshop / Seminar Mon, 03 Feb 2020 18:16:42 -0500 2020-02-03T16:00:00-05:00 2020-02-03T17:00:00-05:00 West Hall Department of Physics Workshop / Seminar West Hall
Science as Art Contest Submission Deadline (February 5, 2020 11:55am) https://events.umich.edu/event/48786 48786-17963888@events.umich.edu Event Begins: Wednesday, February 5, 2020 11:55am
Location: Hatcher Graduate Library
Organized By: Arts at Michigan

Arts at Michigan, ArtsEngine and the Science Learning Center invite you to submit artwork to the 2020 Science as Art exhibition. University of Michigan undergraduate students are invited to submit artwork expressing a scientific principle(s), concept(s), idea(s), process(es), and/or structure(s). The artwork may be visual, literary, musical, video, or performance based. A juried panel using criteria based on both scientific and artistic considerations will choose winning submissions.

Deadline for submissions is Wednesday February 5th!

A number of submissions will be selected for prizes, some of which will be on display and/or performed during the Awards Ceremony and/or displayed in an online Contest Gallery. The entry selected for “Best Overall” will be awarded a cash prize, with smaller cash awards in other categories.

For full information, visit: tinyurl.com/scienceasart2020

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Exhibition Thu, 30 Jan 2020 11:47:29 -0500 2020-02-05T11:55:00-05:00 2020-02-05T23:59:00-05:00 Hatcher Graduate Library Arts at Michigan Exhibition Science as Art logo
HET Brown Bag | The supersymmetric Cardy formula from effective actions (February 5, 2020 12:00pm) https://events.umich.edu/event/72126 72126-17940004@events.umich.edu Event Begins: Wednesday, February 5, 2020 12:00pm
Location: Randall Laboratory
Organized By: Leinweber Center for Theoretical Physics

In this talk I will discuss supersymmetric Cardy formulae in d=4 and d=6. These formulae govern the universal behavior in the high-temperature regime of supersymmetric partition functions — or, in the case of the superconformal index, they govern the high-energy asymptotics of SUSY operators at large energy. I will outline the proof of the Cardy formulae for theories with moduli spaces of vacua, which relies on an effective supersymmetric Chern-Simons action in d-1 dimensions. I will argue that this effective action is universal and intimately related to perturbative as well as global gravitational anomalies. Finally, I will discuss some immediate consequences of our results and briefly compare and distinguish our results to other proposed Cardy formulas.

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Lecture / Discussion Fri, 07 Feb 2020 13:38:08 -0500 2020-02-05T12:00:00-05:00 2020-02-05T13:00:00-05:00 Randall Laboratory Leinweber Center for Theoretical Physics Lecture / Discussion Randall Laboratory
Department Colloquium | Approaches to Fully-3D Dedicated Molecular Breast Imaging (February 5, 2020 4:00pm) https://events.umich.edu/event/71066 71066-17770769@events.umich.edu Event Begins: Wednesday, February 5, 2020 4:00pm
Location: West Hall
Organized By: Department of Physics

The Multi-Modality Imaging Lab at Duke has developed and characterized several dedicated (human) breast imaging devices which offer no compression (no pain!), fast scans, low dose imaging with ionizing radiation for the patient, and fully-3D, isotropic, high resolution quantitative in vivo image information for physicians. The first is a “one-stop” dedicated breast imaging system for utilizing in vivo molecular imaging with Single Photon Emission Computed Tomography (SPECT) using a 4x5 array of 4x4cm^2 pixelated CZT modules combined with low dose x-ray Computed Tomography (CT) utilizing a 40x30cm^2 CsI(Tl) flat-panel detector coupled to a TFT array. The subsystems were developed individually, then hybridized onto a single platform, allowing fully-3D motions of each subsystem. The 3D acquisitions facilitate overcoming sampling insufficiency issues associated with cone-beam CT imaging in the pendant breast frame. Novel x-ray filtering leading to quasi-monochromatic spectra have enabled low dose CT imaging comparable with standard mammography, providing quantitative accuracy within a few percent of NIST values, while optimizing dose efficiency for image quality. Next is a clinically available cardiac SPECT imaging system utilizing 19 compact (8x8cm^2) CZT cameras with pinhole collimators reconfigured for uncompressed, pendant breast and chest wall imaging. The third system utilizes LGSO scintillation crystals coupled to compact position-sensitive photodetectors in two opposed 15x20cm^2 flat panels enabling fully-3D acquisition for dedicated breast Positron Emission Tomography (PET) imaging; this open system can be combined with dedicated CT. The most current system design is for dual PET-MRI breast imaging using an ultra-high sensitivity configuration of PET detector modules to image both breasts simultaneously, and is evaluated by Monte Carlo techniques. These systems can be used to detect occult disease not otherwise seen in contemporary x-ray mammography or tomosynthesis, improve the specificity of cancer diagnosis, and monitor therapeutic response in patients, without causing additional pain (or fear) for the patient.

SHORT BIO: Martin Tornai is an Associate Professor of Radiology (tenured) and Biomedical Engineering, and a faculty member of the Medical Physics Graduate Program at Duke University. He has an undergraduate degree in physics from Cornell and a PhD in biomedical physics from UCLA. Upon completing his doctoral research on intraoperative nuclear imaging devices in 1997, he was recruited to the Duke faculty where he has engaged in numerous activities locally, nationally and internationally. He is a founding faculty member of Duke’s Medical Physics Graduate Program which will celebrate it’s 15th anniversary, and is active on many administrative committees, teaching, and student research committees, helping guide students in their research efforts. His research interests include dedicated nuclear (SPECT & PET) and x-ray based (CT) breast imaging devices, with which several dozen women have been clinically scanned. Along with his numerous MS, PhD and post-doctoral students and various colleagues, he has published over 150 original papers, proceedings articles, and book chapters. His newer interests include dosimetry for nuclear medicine theranostic applications.

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Workshop / Seminar Wed, 05 Feb 2020 18:17:08 -0500 2020-02-05T16:00:00-05:00 2020-02-05T17:00:00-05:00 West Hall Department of Physics Workshop / Seminar West Hall
Startup Career Fair (February 7, 2020 12:00pm) https://events.umich.edu/event/72206 72206-17957291@events.umich.edu Event Begins: Friday, February 7, 2020 12:00pm
Location: Duderstadt Center
Organized By: MPowered Entrepreneurship

Startup Career Fair provides students with the opportunity to pursue their passion and get paid for it. From Productiv in San Francisco to Choco from Berlin, world-renowned startups with mission-driven teams are waiting to hire you.

We invite you to join us on February 7 from 12-4pm at the Duderstadt Center on North Campus. Register by February 4th and you'll be entered into a lottery for an invitation to our exclusive networking breakfast with recruiters. Can’t wait to see you #Launch.

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Careers / Jobs Wed, 29 Jan 2020 13:06:39 -0500 2020-02-07T12:00:00-05:00 2020-02-07T16:00:00-05:00 Duderstadt Center MPowered Entrepreneurship Careers / Jobs #Launch
HET Seminar | Large Signals in the Cosmological Collider (February 7, 2020 3:00pm) https://events.umich.edu/event/71950 71950-17903308@events.umich.edu Event Begins: Friday, February 7, 2020 3:00pm
Location: West Hall
Organized By: Leinweber Center for Theoretical Physics

Cosmological inflation gives a unique opportunity of probing physics at high energies. In particular, non-Gaussianities contain information on new physics particles being produced through the interaction of the inflatons. In this talk, I will discuss the size of such signals and highlight the scenarios in which we expect it to be observable.

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Lecture / Discussion Thu, 23 Jan 2020 11:53:59 -0500 2020-02-07T15:00:00-05:00 2020-02-07T16:00:00-05:00 West Hall Leinweber Center for Theoretical Physics Lecture / Discussion West Hall
Saturday Morning Physics | The Universe Caught Speeding: Dark Energy, Two Decades After (February 8, 2020 10:30am) https://events.umich.edu/event/70879 70879-17726703@events.umich.edu Event Begins: Saturday, February 8, 2020 10:30am
Location: Weiser Hall
Organized By: Saturday Morning Physics

In the late 1990s cosmologists discovered that the expansion of the universe is speeding up, not slowing down as expected. This discovery, honored with the Physics Nobel Prize in 2011, has generated waves in the field of cosmology and presents us with a grand mystery: what is the origin and nature of dark energy, the stuff that causes the accelerated expansion? Professor Huterer will review the exciting new developments in this field, including hints for new physics lurking in the data, and the upcoming ground and space telescopes dedicated to solve the dark energy mystery.

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Workshop / Seminar Fri, 31 Jan 2020 16:43:26 -0500 2020-02-08T10:30:00-05:00 2020-02-08T11:30:00-05:00 Weiser Hall Saturday Morning Physics Workshop / Seminar Dark matter density (left) transitioning to gas density (right). Credit: Illustris Simulations
Special CM-AMO Seminar | Coherent Control of Quantum Pathway Interferences in Spinor Rubidium Condensates (February 10, 2020 2:00pm) https://events.umich.edu/event/72526 72526-18011608@events.umich.edu Event Begins: Monday, February 10, 2020 2:00pm
Location: Randall Laboratory
Organized By: Department of Physics

Ultracold atoms are amongst the excellent test beds to study coherent quantum chemistry due to capabilities of controlling quantum states of the atoms with precision. In my talk, I will discuss how to control quantum pathway interferences in an ultracold molecule formation that is induced by a laser light, a process known as photoassociation (PA). We utilize a Rb-87 Bose-Einstein condensate (BEC) apparatus where all-optically-trapped condensates are prepared in superposition of different spin states in the F=1 hyperfine level. By controlling the cumulative phase of the reactants taking different scattering channels, we interferometrically control the normalized PA rate with perfect visibility. To control the relative phase between the two quantum pathways (scattering channels of spin 0 pairs and spin +1/-1 pairs), we exploit the inherent quadratic energy shift at low magnetic bias field strengths and a free evolution time after a spin population transfer with an RF pulse. Our method also serves as a robust measurement technique to determine quadratic Zeeman energy splitting.

Short bio:
Dr. Hasan Esat Kondakci received his Ph.D. in 2015 from CREOL, the College of Optics & Photonics at the University of Central Florida, where he studied photon statistics in disordered lattices under the supervision of Prof. Bahaa Saleh (primary) and Prof. Ayman Abouraddy. Following his Ph.D., he worked on diffraction-free space-time light sheets and coherence phenomena in Prof. Ayman Abouraddy's lab at CREOL. Currently, he is a postdoctoral researcher in Prof. Yong Chen's lab at the Department of Physics and Astronomy at Purdue University. His current research interests include spin-orbit-coupled Bose-Einstein condensates, photo-association of ultracold atoms, and deterministic state rotations in d-dimensional Hilbert space.

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Workshop / Seminar Mon, 10 Feb 2020 18:16:48 -0500 2020-02-10T14:00:00-05:00 2020-02-10T15:00:00-05:00 Randall Laboratory Department of Physics Workshop / Seminar Randall Laboratory
HEP-Astro Seminar | Low-energy Nuclear Recoils for Fun and Profit (February 10, 2020 4:00pm) https://events.umich.edu/event/71764 71764-17879416@events.umich.edu Event Begins: Monday, February 10, 2020 4:00pm
Location: West Hall
Organized By: Department of Physics

I will discuss the rapidly-changing panorama of experiments seeking to measure the faint signals produced by keV and sub-keV nuclear recoils in radiation detectors. The initial interest in this area originated from searches for dark matter WIMPs, but has expanded with the demonstration of coherent elastic neutrino-nucleus scattering. I will elaborate on the difficulties involved in understanding the response of detecting materials to this type of interaction, including some recent developments. I will also emphasize the opportunities for nuclear recoil detectors in areas beyond dark matter detection.

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Workshop / Seminar Mon, 10 Feb 2020 18:16:48 -0500 2020-02-10T16:00:00-05:00 2020-02-10T17:00:00-05:00 West Hall Department of Physics Workshop / Seminar West Hall
HET Brown Bag | The Large-Misalignment Mechanism for Compact Axion Structures (February 12, 2020 12:00pm) https://events.umich.edu/event/72413 72413-18000398@events.umich.edu Event Begins: Wednesday, February 12, 2020 12:00pm
Location: Randall Laboratory
Organized By: Leinweber Center for Theoretical Physics

Axions are some of the best motivated particles beyond the Standard Model. I will show how the attractive self-interactions of dark matter (DM) axions over a broad range of masses, from 10^−22 eV to 10^7 GeV, can lead to nongravitational growth of density fluctuations and the formation of bound objects. This structure formation enhancement is driven by parametric resonance when the initial field misalignment is large, and it affects axion density perturbations on length scales of order the Hubble horizon when the axion field starts oscillating, deep inside the radiation-dominated era. This effect can turn an otherwise nearly scale-invariant spectrum of adiabatic perturbations into one that has a spike at the aforementioned scales, producing objects ranging from dense DM halos to scalar-field configurations such as solitons and oscillons. This "large-misalignment mechanism" leads to various observational consequences in gravitational lensing and interactions, baryonic structures and star formation, direct detection (including for the QCD axion), and stochastic gravitational waves.

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Lecture / Discussion Fri, 14 Feb 2020 14:06:00 -0500 2020-02-12T12:00:00-05:00 2020-02-12T13:00:00-05:00 Randall Laboratory Leinweber Center for Theoretical Physics Lecture / Discussion Randall Laboratory
Department of Computational Medicine & Bioinformatics (DCMB) Weekly Seminar (February 12, 2020 4:00pm) https://events.umich.edu/event/72535 72535-18015945@events.umich.edu Event Begins: Wednesday, February 12, 2020 4:00pm
Location: Palmer Commons
Organized By: DCMB Seminar Series

Abstract:
Normal mechanical function of the heart requires that ATP be continuously synthesized at a hydrolysis potential of roughly -60 kJ mol-1. Yet in both the aging and diseased heart the relationships between cardiac work rate and concentrations of ATP, ADP, and inorganic phosphate are altered. Important outstanding questions are: To what extent do changes in metabolite concentrations that occur in aging and heart disease affect metabolic/molecular processes in the myocardium? How are systolic and diastolic functions affected by changes in metabolite concentrations? Does metabolic energy supply represent a limiting factor in determining physiological maximal cardiac power output and exercise capacity? Does the derangement of cardiac energetics that occurs with heart failure cause exercise intolerance?

To answer these questions, we have developed a multi-physics multi-scale model of cardiac energy metabolism and cardiac mechanics that simulates the dependence of myocardial ATP demand on muscle dynamics and the dependence of muscle dynamics on cardiac energetics. Model simulations predict that the maximal rate at which ATP can be synthesized at free energies necessary to drive physiological mechanical function determine maximal heart rate, cardiac output, and cardiac power output in exercise. Furthermore, we find that reductions in cytoplasmic adenine nucleotide, creatine, and phosphate pools that occur with aging impair the myocardial capacity to synthesize ATP at physiological free energy levels, and that the resulting changes to myocardial energetic status play a causal role in contributing to reductions in maximal cardiac power output with aging. Finally, model predictions reveal that reductions in cytoplasmic metabolite pools contribute to energetic dysfunction in heart failure, which in turn contributes to causing systolic dysfunction in heart failure.

BlueJeans Livestream Link: https://primetime.bluejeans.com/a2m/live-event/rbuvycdc

3:45 p.m. - Light Refreshments served in Forum Hall Atrium
4:00 p.m. - Lecture in Forum Hall

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Lecture / Discussion Wed, 05 Feb 2020 08:41:29 -0500 2020-02-12T16:00:00-05:00 2020-02-12T17:00:00-05:00 Palmer Commons DCMB Seminar Series Lecture / Discussion
Ace Your Courses: Metacognition is Key! (February 13, 2020 5:00pm) https://events.umich.edu/event/70903 70903-17735208@events.umich.edu Event Begins: Thursday, February 13, 2020 5:00pm
Location: Undergraduate Science Building
Organized By: Science Learning Center

Have you ever found yourself putting forth a great deal of effort into your courses, but not feeling like you are actually learning or are left unsatisfied with your grade? This workshop, based on the work of Dr. Saundra Yancy McGuire, will enable you to analyze your current learning strategies, understand exactly what changes you need to implement to earn an A in your courses, identify concrete strategies to use during the remainder of your semester, and become a more efficient learner.

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Workshop / Seminar Wed, 15 Jan 2020 10:19:28 -0500 2020-02-13T17:00:00-05:00 2020-02-13T18:30:00-05:00 Undergraduate Science Building Science Learning Center Workshop / Seminar Teach Yourself How to Learn by Dr. Saundra Yancy McGuire
HET Seminar | Globally consistent three-family Standard Models in F-theory (February 14, 2020 3:00pm) https://events.umich.edu/event/72170 72170-17948640@events.umich.edu Event Begins: Friday, February 14, 2020 3:00pm
Location: West Hall
Organized By: Leinweber Center for Theoretical Physics

We present recent advances in constructions of globally consistent F-theory compactifications with the exact chiral spectrum of the minimal supersymmetric Standard Model. We highlight the first such example and then turn to a subsequent systematic exploration of the landscape of F-theory three-family Standard Models with a gauge coupling unification. Employing algebraic geometry techniques, all global consistency conditions of these models can be reduced to a single geometric criterion on the base of the underlying elliptically fibered Calabi-Yau four-folds. For toric bases, this criterion only depends on an associated polytope and is satisfied for at least quadrillion bases, each of which defines a distinct compactification. We conclude by pointing out important outstanding issues.

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Lecture / Discussion Tue, 28 Jan 2020 14:33:28 -0500 2020-02-14T15:00:00-05:00 2020-02-14T16:00:00-05:00 West Hall Leinweber Center for Theoretical Physics Lecture / Discussion West Hall
Saturday Morning Physics | Ocean Modeling: Big Computers, Big Science (February 15, 2020 10:30am) https://events.umich.edu/event/71160 71160-17783477@events.umich.edu Event Begins: Saturday, February 15, 2020 10:30am
Location: Weiser Hall
Organized By: Saturday Morning Physics

In this talk, Professor Arbic will describe how ocean circulation models work and how they predict physical motions in the ocean, including currents, eddies, and tides. He will discuss the many applications of ocean models, including short-term ocean forecasting, national security applications, longer-term global change predictions, and preparing for satellite ocean monitoring missions. The talk will focus on the work done in our group here at University of Michigan, with a focus on oceanic eddies and tides.

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Workshop / Seminar Tue, 11 Feb 2020 09:29:14 -0500 2020-02-15T10:30:00-05:00 2020-02-15T11:30:00-05:00 Weiser Hall Saturday Morning Physics Workshop / Seminar The Pleiades Supercomputer which some of the models Professor Arbic uses runs on. (NASA)