Friday 25 December 2015

general relativity - Can quark stars form under an event horizon?


Past the Tolman–Oppenheimer–Volkoff limit, gravity overpowers neutron degeneracy pressure and neutron stars collapse, possibly to black holes. This essay by Graeme Heald suggests that a quark star could form under the event horizon of a black hole, with quark degeneracy pressure preventing the collapse to a singularity. (The Penrose singularity theorem article once claimed it doesn't apply to fermions, "It does not hold for matter described by a super-field, i.e., the Dirac field.")


Is such a quark star possible? (Or any other degeneracy-pressure-supported object under an event horizon?) If so, what's the minimum degeneracy pressure required to resist collapse for a given mass / Schwarzschild radius?




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