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SUMMARY:On `hard stars' in general relativity - Grigorios Fournodavlos - D
 PMMS University of Cambridge
DTSTART:20171117T130000Z
DTEND:20171117T140000Z
UID:TALK95692@talks.cam.ac.uk
CONTACT:Michalis Agathos
DESCRIPTION:After a brief review of the classical results on gravitational
  collapse in spherical symmetry\, from the Oppenheimer-Snyder model (1939)
  to Christodoulou's two-phase model (1995)\, I will discuss one possible e
 nd state in the latter model: hard stars. These are idealized models of ne
 utron stars. I will present a variational characterization and discuss its
  relevance to the orbital stability problem in spherical symmetry. Various
  obstacles to a global in time result are outlined\, in particular the abs
 ence of a dispersion mechanism\, the trapped surface formation scenario du
 e to reflecting boundary conditions (cf. AdS-scalar field) and the possibi
 lity of phase transitions within the two phase model to avoid Rayleigh-Tay
 lor instabilities.
LOCATION:Pavilion B Potter Room (B1.19)
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