Physics

Abstract: I will discuss the path integral of pure 3D gravity on a finite region of spacetime, with boundary conditions that fix dihedral angles or geodesic lengths. This amplitude calculates corrections to the Gaussian statistics of OPE...

Abstract: Event Horizon Telescope (EHT) observations of M87* provide a means of constraining parameters of both the black hole and its surrounding plasma. However, intrinsic variability of the emitting material introduces a major source of...

Abstract: I will talk about the adiabatic cycles of one-dimensional gapped Hamiltonians with non-invertible symmetry. Using quasiadiabatic evolution and the results of gapped phase classification, the adiabatic cycles can be classified by the...

Abstract: I will explain how the irreversibility of the renormalization group together with anomalies, including anomalies in the space of coupling constants, can be used to constrain the IR phases of defects in familiar quantum field theories. As...

Abstract: Recently a fruit fly brain was reconstructed in electron microscopic detail. Tens of millions of synapses were identified on over 100,000 neurons' entangled branches, which would span a football field if unraveled end to end. This "fly...

Abstract: I will review some benefits and consequences of using a Lorentzian gravitational path integral. Time permitting, I will mention some new results on how a Lorentzian path integral ameliorates apparent "entropy paradoxes" in asymptotically...

Abstract: I will discuss a simple model of topological gravity defined by a 3d TQFT summed over all geometries. I will explain how this sum is formulated so that the holographically dual boundary ensemble admits a probabilistic interpretation. This...

Abstract: A class of charged/rotating black holes in asymptotically Anti de-Sitter spacetime is known to undergo superradiant instabilities under which they tend to emit particles carrying charge/angular momentum. In this talk, I will describe new...