High Energy Physics Seminar

[Rosanna Sain]

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HIGH ENERGY PHYSICS SEMINAR
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TUESDAY, 17 JULY 2018, 14:30 p.m.
Luigi Stasi SEMINAR ROOM - ICTP Leonardo Bldg.



M.M. SHEIKH JABBARI
(IPM, Tehran, Iran)


"Soft Hair on Generic Horizons - Implications for Black Hole Microstates"



_Abstract_.Starting from a generic near horizon expansion in any 
spacetime dimension greater than two we 
deriveallnearhorizonsymmetriesanddiscoverawealthofnovelresults:1.Anynon-extremal 
horizon has an infinite set of near horizon symmetries and associated 
soft hair excitations.2. The near horizon symmetries can be represented 
as generalization of the Bondi-Metzner-Sachs algebra. 3. For horizons 
that are either flat or non-rotating the near horizon symmetries can be 
represented 
asHeisenbergalgebras,withonequarteroftheinverseofNewtonconstantplayingtheroleof 
Planck's constant.4. Not only black holes, but also cosmological 
horizons are equipped with soft hair.We discuss implications of soft 
hair for horizon thermodynamics and entropy, and comment on open 
problems and further developments.



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