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Harvey Reall, University of Cambridge, DAMTP
Friday 02 June 2023, 13:00-14:00
Creases, corners and caustics: properties of non-smooth structures on black hole horizons
- đ¤ Speaker: Harvey Reall, University of Cambridge, DAMTP
- đ Date & Time: Friday 02 June 2023, 13:00 - 14:00
- đ Venue: Potter room/Zoom
Abstract
The event horizon of a dynamical black hole is generically a non-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 creases, corners and caustic points. I shall discuss ``perestroikas’’ of these structures, in which they undergo a qualitative change at an instant of time. A crease perestroika gives an exact local description of the event horizon near the ``instant of merger’’ of a generic black hole merger. Other crease perestroikas describe horizon nucleation or collapse of a hole in a toroidal horizon. I shall discuss the possibility that creases contribute to black hole entropy, and the implications of non-smoothness for higher derivative terms in black hole entropy. This talk is based on joint work with Maxime Gadioux.
Series This talk is part of the DAMTP Friday GR Seminar series.
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