Identifier,"Start Date / Time","End Date / Time",Title,Subtitle,Type,Description,Permalink,"Building Name",Room,"Location Name",Cost,Tags,Sponsors
111193-21826195,"2023-09-29 15:00:00","2023-09-29 16:00:00","HET Seminar | Bootstrapping the CFT Landscape","David Poland (Yale)","Lecture / Discussion","From critical phenomena to quantum gravity, conformal field
theories (CFTs) describe the universal scale-invariant structures that lie at
the heart of theoretical physics. The conformal bootstrap is the
powerful idea, dating back to the 70’s, that one can use fundamental
consistency conditions to constrain, solve, and map out the space of
conformal field theories. In this talk I will describe recent progress in using
the conformal bootstrap to perform precise calculations and chart the
landscape of 3d CFTs involving interacting scalars, fermions, and gauge fields.",https://events.umich.edu/event/111193,"West Hall",335,"West Hall",,"High Energy Theory Seminar","Leinweber Center for Theoretical Physics
Department of Physics
HET Seminars
Leinweber Center for Theoretical Physics Seminars
Leinweber Center for Theoretical Physics High Energy Theory Seminars"
112846-21829647,"2023-10-03 12:00:00","2023-10-03 13:00:00","Brown Bag **Special Seminar** | Heisenberg's Path to Quantum Mechanics","Alexander Blum (MPI-Berlin)","Lecture / Discussion","**Special Seminar** Please note time and location
In the summer of 1925, Heisenberg wrote the paper Über quantentheoretische Umdeutung kinematischer und mechanischer Beziehungen, which laid the foundations of quantum mechanics. For a long time, this paper was considered to be inscrutable. This talk will show how one can make sense both of Heisenberg's formal manipulations and of his philosophical rhetoric, in particular by studying the letters he wrote in months leading up to his breakthrough. A particular emphasis will be placed on how different the theory that Heisenberg originally aimed to construct was from modern quantum mechanics",https://events.umich.edu/event/112846,"Randall Laboratory",3481,"Randall Laboratory",,"High Energy Theory Seminar","Leinweber Center for Theoretical Physics
Department of Physics
HET Brown Bag Series
Leinweber Center for Theoretical Physics Seminars
Leinweber Center for Theoretical Physics Brown Bag Seminars"
111196-21826212,"2023-10-06 15:00:00","2023-10-06 16:00:00","HET Seminar | Progress & Challenges for Direct-Detection of Sub-GeV Dark Matter","Rouven Essig (Stony Brook)","Lecture / Discussion","The search for dark matter with masses between meV-to-GeV has seen tremendous theoretical and experimental progress in the past few years. I will provide an overview of some of this progress. I will mention recent results from SENSEI, a Skipper-CCD-based experiment that is sensitive to (halo) dark matter scattering off electrons for masses larger than ~1 MeV. I will highlight how such detectors can, however, also probe sub-MeV dark matter masses by searching for the component of dark matter that is boosted to higher energies from scattering in the Sun. In particular, future detectors with larger exposures could probe the entire “freeze-in” benchmark model down to keV masses. I will also discuss some challenges for direct detection, in particular, novel low-energy backgrounds. I will introduce a new detector concept, the “dual-sided CCD”, which could help with distinguishing some of these backgrounds.",https://events.umich.edu/event/111196,"West Hall",335,"West Hall",,"High Energy Theory Seminar","Leinweber Center for Theoretical Physics
Department of Physics
HET Seminars
Leinweber Center for Theoretical Physics Seminars
Leinweber Center for Theoretical Physics High Energy Theory Seminars"
111198-21826213,"2023-10-20 14:00:00","2023-10-20 15:00:00","HET Seminar | Recent developments in N=4 Yang-Mills Amplitudes","Anastasia Volovich (Brown)","Lecture / Discussion","***Please note this event has been CANCELLED***
The most important experimental probes of fundamental physics involve
the scattering of elementary particles. Over the years we have seen
significant progress in understanding the properties of scattering
amplitudes and in our ability to carry out new computations both for
theoretical and phenomenological purposes. I will overview some recent
developments in N=4 Yang-Mills amplitudes.",https://events.umich.edu/event/111198,"Randall Laboratory",3481,"Randall Laboratory",,"High Energy Theory Seminar","Leinweber Center for Theoretical Physics
Department of Physics
HET Seminars
Leinweber Center for Theoretical Physics Seminars
Leinweber Center for Theoretical Physics High Energy Theory Seminars"
113811-21831737,"2023-10-26 14:00:00","2023-10-26 15:00:00","HET Seminar | Analyticity properties of scatteing amplitude in a theory with a compactified spatial dimension.","Jnan Maharana (Institute of Physics, Bhubaneswar)","Lecture / Discussion","**Please note special date, time and location for this seminar**
NN Khuri, in 1995, considered a potential model where one spatial
dimension was compactified. He adopted Green function method, which has been
used for case of noncompact potential model, to study analyticity property
of forward amplitude and showed it violates dispersion relation (in case of
noncompact potential model dispersionrelation had been proved in 1950's). If
Khuri's result were valid in relativistic QFT it will have serious
consequences (for example proof of Frossart bound will not be valid). Andre
Martin asked me to look at analyticity of amplitude for a theory with
compactified spatial dimension.
I studied analyticity for such a theory in the framework of general field
theory without adopting any specific model. I have proved two results (i)
Forward dispesion relation is valid in relativistic QFT for a massive scalar
field theory with a compact spatial dimention. Thus Khiri's result for
potential scattering does not hold good for relativistic QFT. (ii) I have
gone further; I proved nonforward dispersion relation. Thus I
have gone beyond Khuri.",https://events.umich.edu/event/113811,"Randall Laboratory",3481,"Randall Laboratory",,"High Energy Theory Seminar","Leinweber Center for Theoretical Physics
Department of Physics
HET Seminars
Leinweber Center for Theoretical Physics Seminars
Leinweber Center for Theoretical Physics High Energy Theory Seminars"
111199-21826215,"2023-10-27 15:00:00","2023-10-27 16:00:00","HET Seminar | New attractors for the black hole index","Sameer Murthy (King's College London/IAS)","Lecture / Discussion","The count of black hole microstates is typically obtained from a supersymmetric index in weakly coupled string theory. I will discuss the index in the strongly coupled theory, as a functional integral in N=2 supergravity in asymptotically flat space. The saddle-points of this index are given by supersymmetric ""finite-temperature"" rotating geometries. I will discuss a new version of the attractor mechanism obeyed by these geometries: the scalar fields at the poles of the Euclidean horizon as well as the free energy of the black hole get attracted to values that depend only on the charges and are independent of the asymptotic moduli and temperature.",https://events.umich.edu/event/111199,"West Hall",335,"West Hall",,"High Energy Theory Seminar","Leinweber Center for Theoretical Physics
Department of Physics
HET Seminars
Leinweber Center for Theoretical Physics Seminars
Leinweber Center for Theoretical Physics High Energy Theory Seminars"
114882-21833728,"2023-11-10 15:00:00","2023-11-10 16:00:00","HET Seminar | The Geometry of Electroweak Symmetry Breaking","Nathaniel Craig ( UCSB)","Lecture / Discussion","Effective field theories (EFTs) suffer from a vast redundancy of description, reminiscent of coordinate invariance, that lends itself to a geometric treatment. In this talk I’ll survey recently-developed geometric insights into EFTs of the Standard Model Higgs sector, including invariant distinctions between possible EFTs of the Higgs boson, a new understanding of the connection between EFT geometry and observables, and generalizations of Riemannian field space geometry that encode information about analyticity and unitarity of the EFT. These developments are relevant to ongoing searches at the LHC and sharpen an open question for future colliders: is electroweak symmetry linearly realized by the known particles of the Standard Model?",https://events.umich.edu/event/114882,"West Hall",335,"West Hall",,"High Energy Theory Seminar","Leinweber Center for Theoretical Physics
Department of Physics
HET Seminars
Leinweber Center for Theoretical Physics Seminars
Leinweber Center for Theoretical Physics High Energy Theory Seminars"
111202-21826217,"2023-11-17 15:00:00","2023-11-17 16:00:00","HET Seminar | Correlation functions in TT*-deformed conformal field theories","Ofer Aharony (Weizmann/IAS)","Lecture / Discussion","I will begin by reviewing the movitations for studying the TT* deformation of two dimensional field theories, the original formulation of this deformation, and its formulation in terms of Jackiw-Teitelboim gravity. Then I will discuss how to compute correlation functions of local operators using this formulation, in which the position of the operators is defined using the dynamical coordinates of the formalism. I will focus on the large-momentum behavior of the two-point function when the undeformed theory is a conformal field theory. The main result (based on 2304.14091) is that for momentum q it is given by |q|^{-q^2 t/\pi}, where t is the deformation parameter. Interestingly, the sign of the exponent is different than previous computations which resummed the small momentum expansion. The decay at large momentum manifests the non-locality of the theory, which also appears through the fact that operators with different momentum require a different multiplicative renormalization, and that the large-momentum behavior of the correlation function on the torus is different from the behavior mentioned above on the plane.",https://events.umich.edu/event/111202,"West Hall",335,"West Hall",,"High Energy Theory Seminar","Leinweber Center for Theoretical Physics
Department of Physics
HET Seminars
Leinweber Center for Theoretical Physics Seminars
Leinweber Center for Theoretical Physics High Energy Theory Seminars"
115284-21834377,"2023-12-01 15:00:00","2023-12-01 16:00:00","HET Seminar | On entropy growth in perturbative scattering","Temple He (Caltech)","Lecture / Discussion","Inspired by the second law of thermodynamics, we study the change in subsystem entropy generated by dynamical unitary evolution of a product state in a bipartite system. Working at leading order in perturbative interactions, we prove that the quantum n-Tsallis entropy of a subsystem never decreases, provided that subsystem is initialized as a statistical mixture of states of equal probability. This is true for any choice of interactions and any initialization of the complementary subsystem. When this condition on the initial state is violated, it is always possible to explicitly construct a ""Maxwell's demon'' process that decreases the subsystem entropy. Remarkably, for the case of particle scattering, the circuit diagrams corresponding to n-Tsallis entropy are the same as the on-shell diagrams that have appeared in the modern scattering amplitudes program, and the entropy growth is intimately related to the nonnegativity of cross-sections.",https://events.umich.edu/event/115284,"West Hall",335,"West Hall",,"High Energy Theory Seminar","Leinweber Center for Theoretical Physics
Department of Physics
HET Seminars
Leinweber Center for Theoretical Physics Seminars
Leinweber Center for Theoretical Physics High Energy Theory Seminars"