BHI Colloquium


Tuesday, January 26, 2021, 1:30pm to 2:30pm


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Antony Speranza (Physics) - Perimeter Institute

Title: Symmetries, observables, and entropy of black hole horizons

Abstract: Black holes have long been known to possess an entropy proportional to their horizon area, and an important goal in quantum gravity is to characterize the microstates responsible for this entropy.  One way to approach this task is to identify symmetries of the black hole under which the microstates are expected to transform.  In this talk, I will describe how a set of conformal symmetries can be identified for generic axisymmetric Killing horizons, and further show how these symmetries lead to the black hole entropy via a Cardy formula.  I will also discuss symmetries that appear for more generic subregions, and construct an associated set of charges.  In this case, the area of the bounding surface and a collection of curvature invariants appear as Casimirs of the resulting symmetry algebra, providing an interesting class of observables that can be associated to subregions in general relativity.  

Bio: Antony Speranza is a Postdoctoral Researcher at the Perimeter Institute for Theoretical Physics.  His research largely deals with understanding the role of entanglement entropy in quantum gravity.  He is also interested in techniques for computing entanglement entropy perturbatively in quantum field theories, and the application of these calculations to bulk reconstruction in holography.

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See also: Physics