Essay: The Quantum Gravitational Black Hole Is Neither Black Nor White |
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Authors: | T P Singh Cenalo Vaz |
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Affiliation: | (1) Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai, 400 005, India;(2) Department of Physics, University of Cincinnati, Cincinnati, Ohio |
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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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Keywords: | Black hole entropy information loss problem |
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