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SUMMARY:Patrick Bourg (Southampton U.)
DTSTART:20210617T133000Z
DTEND:20210617T143000Z
DTSTAMP:20260423T021230Z
UID:CENTRA/45
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/CENTRA/45/">
 Critical collapse of a spherically symmetric ultrarelativistic fluid in 2 
 + 1 dimensions</a>\nby Patrick Bourg (Southampton U.) as part of CENTRA Se
 minar\n\n\nAbstract\nWe present new numerical simulations of the gravitati
 onal collapse of a perfect fluid with the ultrarelativistic equation of st
 ate P = κρ\, in spherical symmetry in 2 + 1 spacetime dimensions with Λ
  < 0. At the threshold of prompt collapse\, we find type I (lifetime scale
 s as logarithm of distance from the threshold) and type II critical phenom
 ena (apparent horizon mass and maximum curvature scale as powers of distan
 ce from the threshold) depending on κ. Moreover\, the type II critical so
 lution is not self-similar (as in higher dimensions) but contracting quasi
 -statically.\n
LOCATION:https://researchseminars.org/talk/CENTRA/45/
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