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  • Kobayashi-Hitchin correspondences for harmonic bundles and monopoles

    Virtual

    Speaker: Takuro Mochizuki (Kyoto University) Title: Kobayashi-Hitchin correspondences for harmonic bundles and monopoles Abstract:  In 1960's, Narasimhan and Seshadri discovered the equivalence between irreducible unitary flat bundles and stable bundles of degree $0$ on compact Riemann surfaces. In 1980's, Donaldson, Uhlenbeck and Yau generalized it to the equivalence between irreducible Hermitian-Einstein bundles and stable bundles on smooth […]

  • CMSA-QMMP-02.16.2022-1544x2048

    Topological Quantum Gravity and the Ricci Flow – Part I

    Virtual

    Speaker: Petr Hořava (UC Berkeley) Title: Topological Quantum Gravity and the Ricci Flow – Part I Abstract: In this sequence of talks, I will describe our work with Alexander Frenkel and Stephen Randall, in which we presented a novel topological quantum gravity, relating three previously unrelated fields:  Topological quantum field theories (of the cohomological type), the […]

  • CMSA-NTM-Seminar-02.16.2022-1553x2048

    Bootstrapping hyperbolic manifolds

    Virtual

    https://youtu.be/updzX0XPYU4 Speaker: James Bonifacio, Cambridge DAMTP Title: Bootstrapping hyperbolic manifolds Abstract: Hyperbolic manifolds are a class of Riemannian manifolds that are important in mathematics and physics, playing a prominent role in topology, number theory, and string theory. Associated with a given hyperbolic metric is a sequence of numbers corresponding to the discrete eigenvalues of the […]

  • Fall 2020 – Spring 2022 Quantum Matter in Mathematics and Physics Archive

    This is the Fall 2020 - Spring 2022 Quantum Matter in Mathematics and Physics Archive page. To view current seminars, please visit the Fall 2022-Spring 2023 Quantum Matter Seminar Page As part of the program on Quantum Matter in Mathematics and Physics, the CMSA hosted two weekly seminars. The Quantum Matter/Quantum Field Theory seminar took place […]

  • CMSA-QMMP-02.17.2022-1544x2048

    Spin-cobordisms, surgeries and fermionic modular bootstrap

    Virtual

    Speaker: Andrea Grigoletto (SISSA & INFN) Title: Spin-cobordisms, surgeries and fermionic modular bootstrap Abstract: ‘tHooft anomalies of anomalous systems can be described via anomaly inflow by invertible theories living in one dimension higher. Thanks to this it is possible to provide a general method to determine modular transformations of anomalous 2d fermionic CFTs with general discrete symmetry […]

  • Black Hole dynamics at Large D

    Abstract: I demonstrate that black hole dynamics simplifies – without trivializing – in the limit in which the number of spacetime dimensions D in which the black holes live is taken to infinity. In the strict large D limit and under certain conditions I show the equations that govern black hole dynamics reduce to the equations describing the dynamics of a non gravitational membrane propagating in an unperturbed spacetime (e.g. flat space). In the stationary […]

  • CMSA-Interdisciplinary-Science-Seminar-2.17.2022-1-1583x2048-1

    Sparse Markov Models for High-dimensional Inference

    Abstract: Finite order Markov models are theoretically well-studied models for dependent data.  Despite their generality, application in empirical work when the order is larger than one is quite rare.  Practitioners avoid using higher order Markov models because (1) the number of parameters grow exponentially with the order, (2) the interpretation is often difficult. Mixture of transition […]

  • Quadratic reciprocity from a family of adelic conformal field theories

    Member Seminar Speaker:An Huang Title: Quadratic reciprocity from a family of adelic conformal field theories Abstract: This talk aims to provide a physics framework to understand quadratic reciprocity. Specifically, we consider a deformation of the two-dimensional free scalar field theory by raising the Laplacian to a positive real power. It turns out that the resulting non-local […]

  • CMSA-Algebraic-Geometry-in-String-Theory-02.22.2022

    Higgs-Coulomb correspondence in abelian GLSM

    Virtual

    Abstract: We construct a certain type of Gauged Linear Sigma Model quasimap invariants that generalize the original ones and are easier to compute. Higgs-Coulomb correspondence provides identification of generating functions of our invariants with certain analytic functions that can be represented as generalized inverse Mellin transforms. Analytic continuation of these functions provides wall-crossing results for GLSM […]

  • Holographic Cone of Average Entropies and Universality of Black Holes

    Virtual

    Speaker: Bartek Czech, Tsinghua University Title: Holographic Cone of Average Entropies and Universality of Black Holes Abstract:  In the AdS/CFT correspondence, the holographic entropy cone, which identifies von Neumann entropies of CFT regions that are consistent with a semiclassical bulk dual, is currently known only up to n=5 regions. I explain that average entropies of p-partite subsystems can […]

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    Topological Quantum Gravity and the Ricci Flow – Part II

    Abstract: In this sequence of talks, I will describe our work with Alexander Frenkel and Stephen Randall, in which we presented a novel topological quantum gravity, relating three previously unrelated fields:  Topological quantum field theories (of the cohomological type), the theory of Ricci flows on Riemannian manifolds, and nonrelativistic quantum gravity.  The remarkable richness of […]