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Séminaires à venir dans la série RENC-THEO
[ vue agenda ]

Jeudi 1 Octobre 2020, 11:00 à IHP, Virtual
( arxiv:2002.08346, arxiv:2005.06936 and arxiv:2007.12759 )
RENC-THEO (Rencontres Théoriciennes) hep-th
Celine Zwikel Symmetries at Null Boundaries
Abstract: I will present and motivate a program establishing, in full generality, the symmetries and charge analysis for gravitational theories near a generic null hypersurface without specifying any boundary condition. I will illustrate the first steps of this program on three dimensional Einstein gravity. In this case, there are three charges which are generic functions over the codimension one null surface. The integrability of the charges and the charge algebra depend on the state-dependence of symmetry generators which is a priori not specified. I will establish the existence of infinitely many choices that render the surface charges integrable. Then, I will argue that one expects this result to be valid for d > 3 when there is no Bondi news by developing some aspects of the four dimensional case. Finally, I will put our results in the context of earlier constructions of near horizon symmetries.

Jeudi 8 Octobre 2020, 11:00 à IHP, Zoom RENC-THEO (Rencontres Théoriciennes) hep-th
Roberto Emparan ( U. Barcelona ) Quantum BTZ black hole
Abstract: I will begin by reviewing the framework of braneworld holography as a means of studying quantum effects on black holes including the gravitational backreaction of strongly-coupled conformal fields. Then I will describe a holographic construction of quantum rotating BTZ black holes (quBTZ) using an exact four-dimensional bulk solution. Besides yielding the quantum-corrected geometry and the renormalized stress tensor of quBTZ, we use it to show that the quantum black hole entropy, which includes the entanglement of the fields outside the horizon, rather non-trivially satisfies the first law of thermodynamics, while the Bekenstein-Hawking-Wald entropy does not.

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