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SUMMARY:Anomalies in gravitational charge algebras of null boundaries and 
 black hole entropy - Antony Speranza (Perimeter)
DTSTART:20210311T150000Z
DTEND:20210311T160000Z
UID:TALK155761@talks.cam.ac.uk
CONTACT:Pietro Benetti Genolini
DESCRIPTION:I will discuss how the central charges appearing in near-horiz
 on symmetry algebras arise from an anomalous transformation of the null bo
 undary term in the gravitational action.  This parallels the way in which 
 the holographic Weyl anomaly appears in AdS/CFT\, with the ambiguity in th
 e normalization of the null generator being the analogue of the choice of 
 Weyl frame.  As an application\, I will analyze a generalization of the ne
 ar-horizon Virasoro symmetries of Haco\, Hawking\, Perry\, and Strominger\
 , and give a systematic derivation of the Wald-Zoupas fluxes and central c
 harges.  In particular\, I will discuss a way to define the quasilocal cha
 rges unambiguously\, and show that the central charge computed by the char
 ge algebra is directly related to the horizon entropy via the Cardy formul
 a.  \nBased on https://arxiv.org/abs/2009.10739 and  https://arxiv.org/abs
 /2006.02430
LOCATION:Online (Zoom)
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