Creases, corners and caustics: properties of non-smooth structures on black hole horizons

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• Harvey Reall, University of Cambridge, DAMTP
• Friday 02 June 2023, 13:00-14:00
• Potter room/Zoom.

If you have a question about this talk, please contact Isobel Romero-Shaw.

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.

This talk is part of the DAMTP Friday GR Seminar series.

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