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The Value of Singularities
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We point out that spacetime singularities play a useful role in gravitational theories by eliminating unphysical solutions. In particular, we argue that any modification of general relativity which is completely nonsingular cannot have a stable ground state. This argument applies both to classical extensions of general relativity, and to candidate quantum theories of gravity.
Forward citations
Cited by 5 Pith papers
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Regular black holes from thin-shell collapse
In D≥5 pure gravity with an infinite tower of higher-curvature terms, spherical thin-shell collapse generically produces regular black holes that bounce into new universes.
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The free boundary problem in general relativity
Treating singularities as free boundaries in the Einstein-Hilbert action yields boundary conditions excluding Kasner/BKL spacetimes while admitting conformally regular FLRW cosmologies sourced by 0 ≤ P < ρ fluids with...
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Quantum Schwarzschild-(A)dS Black Holes: Unitarity and Singularity Resolution
Unitarity in unimodular time self-adjointness resolves the Schwarzschild-(A)dS singularity and yields a quantum-corrected metric interpolating between black and white hole states.
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Singularity Resolution of Quantum Black Holes in (A)dS
Requiring unitary evolution in unimodular time resolves the Schwarzschild-(A)dS singularity and yields a quantum-corrected metric with a minimum radius r_min marking a black hole to white hole transition.
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Towards a Non-singular Paradigm of Black Hole Physics
This is a review built around a week-long workshop, synthesizing the state and open problems of regular black holes and black hole mimickers as alternatives to singular black holes.
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