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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