Abstract
Understanding the end state of black hole evaporation, the microscopic origin of black hole entropy, the information loss paradox, and the nature of the singularity arising in gravitational collapse - these are outstanding challenges for any candidate quantum theory of gravity. Recently, a midisuperspace model of quantum gravitational collapse has been solved using a lattice regularization scheme. It is shown that the mass of an eternal black hole follows the Bekenstein spectrum, and a related argument provides a fairly accurate estimate of the entropy. The solution also describes a quantized mass-energy distribution around a central black hole, which in the WKB approximation, is precisely Hawking radiation. The leading quantum gravitational correction makes the spectrum non-thermal, thus providing a plausible resolution of the information loss problem.
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Singh, T.P., Vaz, C. Essay: The Quantum Gravitational Black Hole Is Neither Black Nor White. General Relativity and Gravitation 36, 2589–2594 (2004). https://doi.org/10.1023/B:GERG.0000048979.62382.33
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DOI: https://doi.org/10.1023/B:GERG.0000048979.62382.33