Regular black holes with stable cores
A. BonannoINAF, Osservatorio Astrofisico di Catania, via S. Sofia 78, 95123 Catania, Italy and INFN, Sezione di Catania, via S. Sofia 64, 95123 Catania, ItalyAmir-Pouyan KhosraviINAF, Osservatorio Astrofisico di Catania, via S. Sofia 78, 95123 Catania, Italy and INFN, Sezione di Catania, via S. Sofia 64, 95123 Catania, ItalyFrank SaueressigINAF, Osservatorio Astrofisico di Catania, via S. Sofia 78, 95123 Catania, Italy and INFN, Sezione di Catania, via S. Sofia 64, 95123 Catania, Italy
2021en
ABI
Abstract
Non-singular black hole geometries typically come with two spacetime horizons: an (outer) event horizon and an (inner) Cauchy horizon. This nurtures the speculation that they may be subject to a mass-inflation effect which renders the Cauchy horizon unstable. We analyze the dynamics associated with spherically symmetric, regular black holes taking the full backreaction between the infalling matter and geometry into account. On this basis, we identify the crucial features taming the growth of the mass function and diminishing the curvature singularity at the Cauchy horizon. It is demonstrated explicitly that the regular black hole solutions proposed by Hayward and obtained from Asymptotic Safety satisfy these properties.
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Cited by 30 references