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T-Witts from the horizon

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arxiv 2002.08346 v2 pith:QOF3RQKP submitted 2020-02-19 hep-th gr-qc

T-Witts from the horizon

H. Adami , D. Grumiller , S. Sadeghian , M.M. Sheikh-Jabbari , C. Zwikel This is my paper
classification hep-th gr-qc
keywords algebrablackchargesholehorizonintegrablekerrnull
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Expanding around null hypersurfaces, such as generic Kerr black hole horizons, using co-rotating Kruskal-Israel-like coordinates we study the associated surface charges, their symmetries and the corresponding phase space within Einstein gravity. Our surface charges are not integrable in general. Their integrable part generates an algebra including superrotations and a BMS_3-type algebra that we dub "T-Witt algebra". The non-integrable part accounts for the flux passing through the null hypersurface. We put our results in the context of earlier constructions of near horizon symmetries, soft hair and of the program to semi-classically identify Kerr black hole microstates.

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Cited by 4 Pith papers

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  4. GGI lectures on boundary and asymptotic symmetries

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    A lecture-note review of boundary and asymptotic symmetries that re-derives the BMS group as the asymptotic symmetry group of Minkowski spacetime alone and constructs an integral Hamiltonian generator for scalar-field...