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Regular Black Holes: Towards a New Paradigm of Gravitational Collapse
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Black holes are one of the most fascinating predictions of general relativity. They are the natural product of the complete gravitational collapse of matter and today we have a body of observational evidence supporting the existence of black holes in the Universe. However, general relativity predicts that at the center of black holes there are spacetime singularities, where predictability is lost and standard physics breaks down. It is widely believed that spacetime singularities are a symptom of the limitations of general relativity and must be solved within a theory of quantum gravity. Since we do not have yet any mature and reliable candidate for a quantum gravity theory, researchers have studied toy-models of singularity-free black holes and of singularity-free gravitational collapses in order to explore possible implications of the yet unknown theory of quantum gravity. This book reviews all main models of regular black holes and non-singular gravitational collapses proposed in the literature, and discuss the theoretical and observational implications of these scenarios.
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Cited by 6 Pith papers
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Spectral Bifurcations in Quasinormal Modes of Regular BTZ Black Holes
For regular BTZ black holes from an infinite Lovelock tower, scalar quasinormal modes bifurcate from complex BTZ branches into purely imaginary branches as the regularization length ℓ grows, producing mode switching a...
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A Quantum Superposition of Black Hole Evaporation Histories: Recovering Unitarity
A controlled-squeezing toy model of black hole evaporation with quantum back-reaction is unitary, and the initial black hole state can be recovered from the final radiation.
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Cauchy Horizon (In)Stability of Regular Black Holes
For regular black holes, the Cauchy horizon mass typically grows exponentially or as a power law; for the asymptotically safe collapse model it grows logarithmically, reaching the horizon without a transient mass-infl...
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Doubly regular black holes
Most proposed curvature-regular black hole metrics still contain thermodynamic Davies points, and only specially constructed families are both curvature-regular and thermodynamically regular.
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Bondi accretion disk luminosity around neutral and charged Simpson-Visser spacetimes
Bondi accretion is computed in Simpson-Visser and charged Simpson-Visser spacetimes, but the reported critical (sonic) radii are not supported by the paper's own equations.
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Regular Spacetimes in the Effective Metric Description
Within the Effective Metric Description, the paper derives regularity conditions at the origin and horizons, a necessary geodesic-completeness condition, and a classification of regular cores.
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