PIRSA:23090105

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

Reall, H. (2023). Creases, corners and caustics: properties of non-smooth structures on black hole horizons. Perimeter Institute. https://pirsa.org/23090105

Reall, Harvey. Creases, corners and caustics: properties of non-smooth structures on black hole horizons. Perimeter Institute, Sep. 21, 2023, https://pirsa.org/23090105 

          @misc{ pirsa_PIRSA:23090105,
            doi = {10.48660/23090105},
            url = {https://pirsa.org/23090105},
            author = {Reall, Harvey},
            keywords = {Quantum Gravity},
            language = {en},
            title = {Creases, corners and caustics: properties of non-smooth structures on black hole horizons},
            publisher = {Perimeter Institute},
            year = {2023},
            month = {sep},
            note = {PIRSA:23090105 see, \url{https://pirsa.org}}
          }

Harvey Reall

University of Cambridge

Talk number
PIRSA:23090105
Collection
Talk Type
Subject
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.

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Zoom link: https://pitp.zoom.us/j/98839294408?pwd=cytNYThQaDV4Y2lob1REY0NyaTJNUT09