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What is the surface of a black hole?
  KTH/Nordita/SU seminar in Theoretical Physics [before December 2013]

Wednesday 20 May 2009
from 11:00 to 12:00
at FA31
Speaker : Jose M M Senovilla (Bilbao)
Abstract : The exterior limit of a Black Hole is considered by studying the related concept, introduced by Penrose on the 1960's, of a closed trapped surface. The physical meaning of these surfaces and their relevance will be briefly analyzed. Some surprising non-local properties will be presented. The natural candidates for the surface of a Black Hole, its event horizon or trapping horizons, have some problems: the former suffers from a global teleological problem, the latter will be seen to be crossed by closed trapped surfaces. Thus, the question of how to define the surface of a black hole may be related with the exterior boundary enclosing all closed trapped surfaces. Some examples will be given.

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