Events at 402 Classroom Physics South, Campus

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Mirror symmetry aims at equivalences of Fukaya categories (A-side) and categories of coherent sheaves (B-side). Deformed mirror symmetry aims at matching deformations of A-side and B-side. In this talk, I explain how to do it in case of mirror symmetry for punctured surfaces. We start by constructing gentle algebras and matrix factorizations, which serve as A-side and B-side. Then we … Read More

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Abstract: The NSF’s Laser Interferometer Gravitational-wave Observatory (LIGO) made the historic first observation of gravitational-waves (GWs) from a binary black hole merger on September 14, 2015 — almost exactly 10 years prior to the day of this talk. Here, we celebrate the 10-year anniversary of LIGO’s first direct detection by sharing the newest gravitational-wave event catalogue, GWTC-4.0, from our international LIGO-Virgo-KAGRA … Read More

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Three dimensional hyperbolic manifolds have accumulation points in the spectrum of their volumes, leading to a divergence in the sum over topologies. The limit points are cusped hyperbolic manifolds, and we propose to renormalize the sum by including the cusped manifold as a counterterm. This gives a reinterpretation of the zeta-function regularization procedure used by Maloney and Witten in the … Read More

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Abstract: Energy correlators are a class of cleverly constructed collider observables that provides unique insights into the field theory structure and phenomenology of QCD. In this talk, I study the leading nonperturbative contribution to energy correlators using field theory methods and discuss the universality across event shape observables of such contributions. I show that correctly including the nonperturbative improves our … Read More

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I will briefly review the observations of UHECRs, emphasizing which aspects are robust and which remain uncertain. Among the robust aspects, a key feature of the data strongly suggests that UHECRs are produced in BNS mergers.  Taking advantage of the well-defined initial conditions, I will identify the likely acceleration mechanism and explain how the spectral cutoff is determined.  The resulting … Read More

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We consider the algebra of gravitational perturbations of the subregion of spacetime corresponding to the exterior of a black hole or the static patch of de Sitter. The algebra of gravitational perturbations are subject to constraints arising from the group of large gauge transformations of the subregion. Physically, these constraints arise due to the backreaction of gravitational perturbations on the … Read More