Speaker: Patrick Bourg (Southampton U.)
Title: Critical collapse of a spherically symmetric ultrarelativistic fluid in 2 + 1 dimensions
We present new numerical simulations of the gravitational collapse of a perfect fluid with the ultrarelativistic equation of state P = κρ, in spherical symmetry in 2 + 1 spacetime dimensions with Λ < 0. At the threshold of prompt collapse, we find type I (lifetime scales as logarithm of distance from the threshold) and type II critical phenomena (apparent horizon mass and maximum curvature scale as powers of distance from the threshold) depending on κ. Moreover, the type II critical solution is not self-similar (as in higher dimensions) but contracting quasi-statically.
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