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SUMMARY:Near horizon symmetries of extremal black holes - Hari Kunduri (DA
 MTP)
DTSTART:20071019T120000Z
DTEND:20071019T130000Z
UID:TALK8711@talks.cam.ac.uk
CONTACT:Daniel Wesley
DESCRIPTION:Recently\, an attractor mechanism for extremal\, rotating blac
 k holes was demonstrated. The proof relied on the assumption that the near
 -horizon of an extermal black holes has an SO(2\,1) isometry. After a basi
 c review of near horizon geometries\, I wlil prove the existence of this s
 ymmetry for any extremal black hole with the same number of rotational sym
 metries as all known black holes in four and five dimensions.  The result 
 holds for a general two-derivative theory of gravity coupled to abelian ga
 uge fields and neutral scalars\, and remains stable to higher-derivative c
 orrections. Finally I will demonstrate how one can use analytic continuati
 on to relate SU(2)-invariant black hole solutions to SO(2\,1)-symmetric ne
 ar horizon geometries. The talk is based on work with J.Lucietti and H.S.R
 eall that appeared in "arXiv:0705.4214":http://uk.arxiv.org/abs/0705.4214\
 n
LOCATION:Pavilion B Meeting Room 9
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