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Regular black holes from Loop Quantum Gravity
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There is rich literature on regular black holes from loop quantum gravity (LQG), where quantum geometry effects resolve the singularity, leading to a quantum extension of the classical space-time. As we will see, the mechanism that resolves the singularity can also trigger conceptually undesirable features that can be subtle and are often uncovered only after a detailed examination. Therefore, the quantization scheme has to be chosen rather astutely. We illustrate the new physics that emerges first in the context of the eternal black hole represented by the Kruskal space-time in classical general relativity, then in dynamical situations involving gravitational collapse, and finally, during the Hawking evaporation process. The emphasis is on novel conceptual features associated with the causal structure, trapping and anti-trapping horizons and boundedness of invariants associated with curvature and matter. This Chapter is not intended to be an exhaustive account of all LQG results on non-singular black holes. Rather, we have selected a few main-stream thrusts to anchor the discussion, and provided references where further details as well as discussions of related developments can be found. In the spirit of this Volume, the goal is to present a bird's eye view that is accessible to a broad audience.
Forward citations
Cited by 5 Pith papers
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Thermodynamics of Black Holes, far from Equilibrium
The paper derives finite, physical-process versions of the first and second laws of black hole thermodynamics for dynamical horizon segments, extending the first law to black holes arbitrarily far from equilibrium.
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Love Numbers of Covariant Loop Quantum Black Holes
Tidal Love numbers of three covariant loop quantum black holes are shown to be generically nonzero, Planck-scale suppressed, and model-dependent in sign and logarithmic running.
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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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Lessons from gauge fixing and polymerization of loop quantum black holes with a cosmological constant
Constant-polymerization loop quantization of Schwarzschild-de Sitter in Kantowski-Sachs gauge generates a spurious low-curvature black hole horizon, while Schwarzschild-anti-de Sitter does not.
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The shadow and accretion disk images of the rotation loop quantum black bounce
Simulated shadows and disk images of the rotating LQG black bounce show parameter-dependent shadow contraction, Doppler asymmetry, and hat-like lensed image morphology.
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