An evaporating black hole in quadratic gravity may spontaneously turn into a stable naked singularity driven by a ghost-induced instability.
Hawking,Commun.Math.Phys.43, 199-220 (1975);Phys.Rev.D14, 2460-2473 (1976)
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Spontaneous ghostification: how a dying black hole comes back as a naked singularity
An evaporating black hole in quadratic gravity may spontaneously turn into a stable naked singularity driven by a ghost-induced instability.