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SUMMARY:Creases\, corners and caustics: properties of non-smooth structure
 s on black hole horizons - Harvey Reall\, University of Cambridge\, DAMTP
DTSTART:20230602T120000Z
DTEND:20230602T130000Z
UID:TALK199513@talks.cam.ac.uk
CONTACT:Isobel Romero-Shaw
DESCRIPTION:The event horizon of a dynamical black hole is generically a n
 on-smooth hypersurface. I shall describe the types of non-smooth structure
  that can arise on a horizon that is smooth at late time. This includes cr
 eases\, corners and caustic points. \nI shall discuss ``perestroikas'' of 
 these structures\, in which they undergo a qualitative change at an instan
 t of time. A crease perestroika gives an exact local description of the ev
 ent horizon near the ``instant of merger'' of a generic black hole merger.
  Other crease perestroikas describe horizon nucleation or collapse of a ho
 le in a toroidal horizon. I shall discuss the possibility that creases con
 tribute to black hole entropy\, and the implications of non-smoothness for
  higher derivative terms in black hole entropy. This talk is based on join
 t work with Maxime Gadioux. 
LOCATION:Potter room/Zoom
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