Events at 402 Classroom Physics South Hall, Campus

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We introduce a new algebraic framework to describe gravitational scrambling, including the semiclassical limit of any out-of-time-order correlation function that consists of s-wave operator insertions separated by approximately the scrambling time. This algebra, which we call a modular-twisted product, is defined starting from two half-sided modular inclusions of von Neumann algebras, interpreted physically as the large N limit of products … Read More

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I will propose a mechanism, based on the Chern-Simons formulation of three-dimensional Euclidean gravity, that couples matter fields to three-dimensional de Sitter quantum gravity. First, I will derive su(2) representations that differ in Hermiticity choice from the usual unitary representations; these are important for gravitational applications of Chern-Simons theory. I will then introduce the concept of a “Wilson spool” constructed … Read More

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Abstract: Leptogenesis has become one of the leading theories to explain the baryon asymmetry of the universe. The existence of non-zero but tiny neutrino masses has been established through neutrino oscillation experiments. The smallness of the neutrino masses can be understood by introducing heavy right-handed neutrinos. If such neutrinos were produced in the early universe and decayed out of equilibrium, … Read More

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Abstract:The proposal that DSSYK at infinite temperature is dual to JT deSitter space leads to the question of what the bulk theory is like, its particle spectrum, forces, fields etc. I will answer that question by examining the emergent symmetries of the double scaled limit. The answer: The ‘t Hooft model 2D QCD. The spectrum consists of a Regge-like trajectory … Read More

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Abstract: It is well-known that CP violation is one of the necessary ingredients to generate the observed matter-antimatter asymmetry of the Universe. Neutral /B/mesons naturally exhibit CP violating oscillations which can be related to the baryon asymmetry through the /B/-mesogenesis mechanism. With this in mind, it is interesting to analyze how large this CP violation could be in different scenarios … Read More

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Abstract:  Inverse Hamiltonian reduction refers to a series of conjectural relations between W-algebras corresponding to distinct nilpotent orbits in a Lie algebra. I will outline a proof of this conjecture in type A that relies on novel geometric methods. Along the way, we shall encounter the localization of vertex algebras and, time permitting, speak briefly on the deformation theory thereof. … Read More

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Abstract: In this talk I will discuss an entropic puzzle in pure JT gravity and its resolution, which requires taking into account (doubly) non-perturbative effects in the gravitational path integral. In JT gravity, which is dual to a random matrix ensemble, the gravitational thermal entropy becomes negative at very low temperatures. This puzzle arises when computing the annealed (instead of quenched) entropy, … Read More

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Abstract:  In this talk, I will discuss an information paradox in black hole physics where the entanglement entropy across a two-sided black hole can become negative when inserting a large number of matter excitations behind the black hole horizon. First posed by Lin, Maldacena, Rosenberg, and Shan in two-sided BPS black holes in SUSY JT gravity, I will show this paradox … Read More

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Abstract: In recent years we have used Anomaly-mediated SUSY breaking (AMSB) to obtain exact results about the strongly-coupled phases of many non-SUSY gauge theories. Particularly interesting is the application to gauge theories for which an analogy with known results in QCD is not available. I will explain how these results can be used for novel dark matter model building. First … Read More

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This will be a report on a joint project with Yalong Cao, Yehao Zhou, and Zijun Zhou, in which we systematically explore the world of stable envelopes in critical cohomology and critical K-theory. We will compare and contrast old stable envelope to the more general critical stable envelopes, with an emphasis on the contrasting features.