University of Cambridge > Talks.cam > Quantum Fields and Strings Seminars > Anomalies in gravitational charge algebras of null boundaries and black hole entropy

Anomalies in gravitational charge algebras of null boundaries and black hole entropy

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  • UserAntony Speranza (Perimeter)
  • ClockThursday 11 March 2021, 15:00-16:00
  • HouseOnline (Zoom).

If you have a question about this talk, please contact Pietro Benetti Genolini.

I will discuss how the central charges appearing in near-horizon symmetry algebras arise from an anomalous transformation of the null boundary term in the gravitational action. This parallels the way in which the holographic Weyl anomaly appears in AdS/CFT, with the ambiguity in the normalization of the null generator being the analogue of the choice of Weyl frame. As an application, I will analyze a generalization of the near-horizon Virasoro symmetries of Haco, Hawking, Perry, and Strominger, and give a systematic derivation of the Wald-Zoupas fluxes and central charges. In particular, I will discuss a way to define the quasilocal charges unambiguously, and show that the central charge computed by the charge algebra is directly related to the horizon entropy via the Cardy formula. Based on https://arxiv.org/abs/2009.10739 and https://arxiv.org/abs/2006.02430

This talk is part of the Quantum Fields and Strings Seminars series.

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