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DTSTART:20070311T020000
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BEGIN:VEVENT
DTSTAMP:20230925T100153
DTSTART;TZID=America/Detroit:20230929T150000
DTEND;TZID=America/Detroit:20230929T160000
SUMMARY:Lecture / Discussion:HET Seminar | Bootstrapping the CFT Landscape
DESCRIPTION:From critical phenomena to quantum gravity\, conformal field\ntheories (CFTs) describe the universal scale-invariant structures that lie at\nthe heart of theoretical physics. The conformal bootstrap is the\npowerful idea\, dating back to the 70’s\, that one can use fundamental\nconsistency conditions to constrain\, solve\, and map out the space of\nconformal field theories. In this talk I will describe recent progress in using\nthe conformal bootstrap to perform precise calculations and chart the \nlandscape of 3d CFTs involving interacting scalars\, fermions\, and gauge fields.
UID:111193-21826195@events.umich.edu
URL:https://events.umich.edu/event/111193
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:High Energy Theory Seminar
LOCATION:West Hall - 335
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20230921T090113
DTSTART;TZID=America/Detroit:20231003T120000
DTEND;TZID=America/Detroit:20231003T130000
SUMMARY:Lecture / Discussion:Brown Bag **Special Seminar** | Heisenberg's Path to Quantum Mechanics
DESCRIPTION:**Special Seminar** Please note time and location\nIn 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
UID:112846-21829647@events.umich.edu
URL:https://events.umich.edu/event/112846
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:High Energy Theory Seminar
LOCATION:Randall Laboratory - 3481
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20231003T131851
DTSTART;TZID=America/Detroit:20231006T150000
DTEND;TZID=America/Detroit:20231006T160000
SUMMARY:Lecture / Discussion:HET Seminar | Progress & Challenges for Direct-Detection of Sub-GeV Dark Matter
DESCRIPTION: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.
UID:111196-21826212@events.umich.edu
URL:https://events.umich.edu/event/111196
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:High Energy Theory Seminar
LOCATION:West Hall - 335
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20231018T122051
DTSTART;TZID=America/Detroit:20231020T140000
DTEND;TZID=America/Detroit:20231020T150000
SUMMARY:Lecture / Discussion:HET Seminar | Recent developments in N=4 Yang-Mills Amplitudes
DESCRIPTION:***Please note this event has been CANCELLED***\n\n\nThe most important experimental probes of fundamental physics involve\nthe scattering of elementary particles. Over the years we have seen\nsignificant progress in understanding the properties of scattering\namplitudes and in our ability to carry out new computations both for\ntheoretical and phenomenological purposes. I will overview some recent\ndevelopments in N=4 Yang-Mills amplitudes.
UID:111198-21826213@events.umich.edu
URL:https://events.umich.edu/event/111198
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:High Energy Theory Seminar
LOCATION:Randall Laboratory - 3481
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20231010T151508
DTSTART;TZID=America/Detroit:20231026T140000
DTEND;TZID=America/Detroit:20231026T150000
SUMMARY:Lecture / Discussion:HET Seminar | Analyticity properties of scatteing amplitude in a theory with a compactified spatial dimension.
DESCRIPTION:**Please note special date\, time and location for this seminar**\n\nNN Khuri\, in 1995\, considered a potential model where one spatial\ndimension was compactified. He adopted Green function method\, which has been\nused for case of noncompact potential model\, to study analyticity property\nof forward amplitude and showed it violates dispersion relation (in case of\nnoncompact potential model dispersionrelation had been proved in 1950's). If\nKhuri's result were valid in relativistic QFT it will have serious\nconsequences (for example proof of Frossart bound will not be valid). Andre\nMartin asked me to look at analyticity of amplitude for a theory with\ncompactified spatial dimension.\nI studied analyticity for such a theory in the framework of general field\ntheory without adopting any specific model. I have proved two results (i)\nForward dispesion relation is valid in relativistic QFT for a massive scalar\nfield theory with a compact spatial dimention. Thus Khiri's result for\npotential scattering does not hold good for relativistic QFT. (ii) I have\ngone further\; I proved nonforward dispersion relation. Thus I\nhave gone beyond Khuri.
UID:113811-21831737@events.umich.edu
URL:https://events.umich.edu/event/113811
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:High Energy Theory Seminar
LOCATION:Randall Laboratory - 3481
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20231019T141745
DTSTART;TZID=America/Detroit:20231027T150000
DTEND;TZID=America/Detroit:20231027T160000
SUMMARY:Lecture / Discussion:HET Seminar | New attractors for the black hole index
DESCRIPTION: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.
UID:111199-21826215@events.umich.edu
URL:https://events.umich.edu/event/111199
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:High Energy Theory Seminar
LOCATION:West Hall - 335
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20231105T052645
DTSTART;TZID=America/Detroit:20231110T150000
DTEND;TZID=America/Detroit:20231110T160000
SUMMARY:Lecture / Discussion:HET Seminar | The Geometry of Electroweak Symmetry Breaking
DESCRIPTION: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?
UID:114882-21833728@events.umich.edu
URL:https://events.umich.edu/event/114882
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:High Energy Theory Seminar
LOCATION:West Hall - 335
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20231019T141647
DTSTART;TZID=America/Detroit:20231117T150000
DTEND;TZID=America/Detroit:20231117T160000
SUMMARY:Lecture / Discussion:HET Seminar | Correlation functions in TT*-deformed conformal field theories
DESCRIPTION: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.
UID:111202-21826217@events.umich.edu
URL:https://events.umich.edu/event/111202
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:High Energy Theory Seminar
LOCATION:West Hall - 335
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20231116T103655
DTSTART;TZID=America/Detroit:20231201T150000
DTEND;TZID=America/Detroit:20231201T160000
SUMMARY:Lecture / Discussion:HET Seminar | On entropy growth in perturbative scattering
DESCRIPTION: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.
UID:115284-21834377@events.umich.edu
URL:https://events.umich.edu/event/115284
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:High Energy Theory Seminar
LOCATION:West Hall - 335
CONTACT:
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