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DTSTART:20070311T020000
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BEGIN:VEVENT
DTSTAMP:20261008T191237
DTSTART;TZID=America/Detroit:20261028T120000
DTEND;TZID=America/Detroit:20261028T130000
SUMMARY:Lecture / Discussion:HET Brown Bag Seminar | What is the simplest holographic matrix model?
DESCRIPTION:I’ll talk about a Hermitian two matrix model called the Hoppe model\, which has an interesting strong coupling limit where the matrices commute with each other. Furthermore\, there exists an emergent area preserving diffeomorphism symmetry of this model at strong coupling\, which allows us to completely solve it at leading order. The solution for all n-point connected correlators takes the form of a Witten diagram-like expansion in an emergent two-dimensional spacetime. I’ll also briefly talk about commuting strong coupling limits in more general multi-matrix integrals\, including supersymmetric ones. The talk will be based on https://arxiv.org/pdf/2608.14781 and https://arxiv.org/pdf/2607.21593.
UID:151080-21910843@events.umich.edu
URL:https://events.umich.edu/event/151080
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:brown bag,Brown Bag Seminar,Lecture,Physics,Science
LOCATION:Randall Laboratory - 3481
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20261022T161414
DTSTART;TZID=America/Detroit:20261030T150000
DTEND;TZID=America/Detroit:20261030T160000
SUMMARY:Lecture / Discussion:HET Seminar |  Fundamental Physics from Large-Scale Structure Cosmology
DESCRIPTION:I will present a program for extracting cosmological information by combining effective field theory techniques with data from galaxy surveys. I will highlight previous successes of this program and share new results from my independent re-analyses of the public DESI survey data\, which incorporate additional information from higher-order statistics. These results include new measurements of fundamental cosmological parameters and tight constraints on neutrino masses\, cosmic inflation\, dark matter\, and the dark energy equation of state. I will argue that the dark energy results may hint at new a fundamental force between dark matter and dark energy\, which can be tested with upcoming large-scale structure data.
UID:151804-21912196@events.umich.edu
URL:https://events.umich.edu/event/151804
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Talk,High Energy Theory Seminar,Lecture,Physics,Science,Seminar
LOCATION:Randall Laboratory - 4404
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20261022T124900
DTSTART;TZID=America/Detroit:20261104T120000
DTEND;TZID=America/Detroit:20261104T130000
SUMMARY:Lecture / Discussion:HET Brown Bag Seminar | Suppressed Quantum Effects of Weakly Coupled Waves
DESCRIPTION:Searches for axion dark matter and gravitational waves are rapidly expanding\, with new experiments deploying quantum sensing techniques to reach unprecedented precision. But does one need to account for the quantum nature of the axion or GW itself? I will exhibit two severe obstructions. First\, realistic detectors cannot resolve the fundamental modes of a field\; instead they couple to coarse-grained \"effective\" modes\, which often washes out nonclassical effects. Second\, all nonclassical effects are suppressed by extra powers of the weak coupling\, making them much harder to detect than the waves themselves. This suppression applies to all observables\, including quadrature and number statistics\, entanglement\, and decoherence\, and rules out many proposed methods to detect the quantization of gravity.
UID:151159-21910990@events.umich.edu
URL:https://events.umich.edu/event/151159
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:brown bag,Brown Bag Seminar,Lecture,Physics,Science,Talk
LOCATION:Randall Laboratory - 3481
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20261022T210707
DTSTART;TZID=America/Detroit:20261106T150000
DTEND;TZID=America/Detroit:20261106T160000
SUMMARY:Lecture / Discussion:HET Seminar |  On the origin of Flavor and CP Violation
DESCRIPTION:I will present recent work on several aspects of flavor physics\, motivated by suggestive patterns in high-precision data. First\, I will discuss CKM unitarity constraints\, focusing on the angles of the unitarity triangle and on intriguing hints of spontaneous CP violation. Then\, I will argue that Standard Model running of the Yukawa couplings points to quark–lepton unification at a surprisingly low scale. Simple Pati–Salam theories of flavor can realize this for all three generations\, with predictions within reach of upcoming searches for charged-lepton flavor violation.
UID:150864-21910328@events.umich.edu
URL:https://events.umich.edu/event/150864
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Physics,High Energy Theory Seminar,Science,Seminar
LOCATION:Randall Laboratory - 4404
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20261023T072027
DTSTART;TZID=America/Detroit:20261111T120000
DTEND;TZID=America/Detroit:20261111T130000
SUMMARY:Lecture / Discussion:HET Brown Bag Seminar | Growing large SMBH at early times with dark atoms
DESCRIPTION:Observations by JWST have indicated the presence of large SMBH within the first 500 Myr of the universe. The existence of these black holes require the BH seeds to grow faster than allowed by the Eddington limit. In this talk I will consider the growth of these black holes if a small component of dark matter was dissipative in nature. Using dark atoms as a concrete example of dissipative dark matter\, we show that it is possile to grow large BHs in the early universe through accretion of dark atoms or by starting out with larger seeds.
UID:151160-21910991@events.umich.edu
URL:https://events.umich.edu/event/151160
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Science,brown bag,Brown Bag Seminar,Lecture,Physics,Talk
LOCATION:Randall Laboratory - 3481
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20261026T085513
DTSTART;TZID=America/Detroit:20261113T150000
DTEND;TZID=America/Detroit:20261113T160000
SUMMARY:Lecture / Discussion:HET Seminar | Euclidean Wormholes and Axion Cosmology
DESCRIPTION:Axions arise ubiquitously in theories of particle physics and quantum gravity and may play important roles in cosmology\, from inflation and dark matter to dark energy. This raises a basic question: does quantum gravity constrain the allowed parameter space of axions\, and can such constraints have observable consequences? I will discuss how Euclidean wormholes provide a surprising connection between these questions and quantum gravity. I will first review the axionic Weak Gravity Conjecture (aWGC)\, including the importance of its order-one coefficient for axion phenomenology\, and then describe how Euclidean wormholes may give rise to this bound. I will discuss the perturbative stability of axion wormholes and their explicit realization in string theory\, both in flat space and in AdS. Finally\, I will present recent work showing that the aWGC can arise directly from the nonperturbative fragmentation of Euclidean wormholes into charged defects. Requiring such fragmentation to lower the Euclidean action fixes the action-to-charge bound and its order-one coefficient\, and reveals a direct connection to the Imaginary Distance Bound. This suggests that quantum-gravitational constraints on axions can be understood as conditions on the non-perturbative stability of gravitational saddles\, with implications for axion cosmology and the consistency of effective field theories.
UID:151162-21910993@events.umich.edu
URL:https://events.umich.edu/event/151162
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:High Energy Theory Seminar,Lecture,Physics,Science,Seminar,Talk
LOCATION:West Hall - 340
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260901T084933
DTSTART;TZID=America/Detroit:20261118T120000
DTEND;TZID=America/Detroit:20261118T130000
SUMMARY:Lecture / Discussion:HET Brown Bag |
DESCRIPTION:tbd
UID:151289-21911322@events.umich.edu
URL:https://events.umich.edu/event/151289
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Science,Talk,Physics,Lecture,Brown Bag Seminar,brown bag
LOCATION:Randall Laboratory - 3481
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260908T152059
DTSTART;TZID=America/Detroit:20261120T150000
DTEND;TZID=America/Detroit:20261120T160000
SUMMARY:Lecture / Discussion:HET Seminar |
DESCRIPTION:tbd
UID:151751-21912130@events.umich.edu
URL:https://events.umich.edu/event/151751
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:High Energy Theory Seminar,Lecture,Physics,Science,Seminar
LOCATION:Randall Laboratory - 4404
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260829T095001
DTSTART;TZID=America/Detroit:20261202T120000
DTEND;TZID=America/Detroit:20261202T130000
SUMMARY:Lecture / Discussion:HET Brown Bag Seminar |
DESCRIPTION:tbd
UID:151161-21910992@events.umich.edu
URL:https://events.umich.edu/event/151161
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Talk,brown bag,Brown Bag Seminar,Lecture,Physics,Science
LOCATION:Randall Laboratory - 3481
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260902T123913
DTSTART;TZID=America/Detroit:20261204T150000
DTEND;TZID=America/Detroit:20261204T160000
SUMMARY:Lecture / Discussion:HET Seminar
DESCRIPTION:tbd
UID:151403-21911505@events.umich.edu
URL:https://events.umich.edu/event/151403
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Seminar,Science,Physics,Lecture,High Energy Theory Seminar
LOCATION:Randall Laboratory - 4404
CONTACT:
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