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SUMMARY:Non-smooth horizons in Kerr black hole mergers - Maxime Gadioux\, 
 DAMTP\, University of Cambridge
DTSTART:20240517T120000Z
DTEND:20240517T130000Z
UID:TALK216796@talks.cam.ac.uk
CONTACT:Xi Tong
DESCRIPTION:Dynamical black holes are known to develop non-smooth structur
 es on their horizon. We begin by reviewing a classification of all generic
  non-smooth structures that may appear on black hole horizons in four-dime
 nsional spacetimes. Introducing a time function\, we describe how two of t
 hese features – namely creases and caustics – evolve\, and in particul
 ar discuss processes known as ‘perestroikas’\, where the non-smooth st
 ructure on a horizon cross-section changes qualitatively. We then study th
 e merger of two Kerr black holes in the extreme mass ratio limit\, and foc
 us on the creases and caustics that are present on the horizon. We explain
  how our results differ from an older analysis of the same system by Empar
 an et al.\, and show that these novel results are consistent with the prop
 erties of creases expected generically. This talk is based on work done wi
 th Harvey Reall and Robie Hennigar.
LOCATION:Potter room/Zoom
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