Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2007-07-26
Class.Quant.Grav.24:4875-4879,2007
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
8 pages; v2: references added, typos corrected, version to appear in CQG
Scientific paper
10.1088/0264-9381/24/18/N02
Microscopic state counting for a black hole in Loop Quantum Gravity yields a result proportional to horizon area, and inversely proportional to Newton's constant and the Immirzi parameter. It is argued here that before this result can be compared to the Bekenstein-Hawking entropy of a macroscopic black hole, the scale dependence of both Newton's constant and the area must be accounted for. The two entropies could then agree for any value of the Immirzi parameter, if a certain renormalization property holds.
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