Universal Counting of Black Hole Entropy by Strings on the Stretched Horizon

Physics – High Energy Physics – High Energy Physics - Theory

Scientific paper

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21 pages in phyzzx.tex, numerous minor changes, dyonic string added as an example, one reference added

Scientific paper

10.1088/1126-6708/2001/12/005

We show that the entropy of any black object in any dimension can be understood as the entropy of a highly excited string on the stretched horizon. The string has a gravitationally renormalized tension due to the large redshift near the horizon. The Hawking temperature is given by the Hagedorn temperature of the string. As examples, we consider black holes with one (black p-branes) or two charges, Reissner-Nordstrom black holes and the BTZ black hole in addition to Schwarzschild black holes. We show that the vanishing and nonvanishing extremal entropies can be obtained as smooth limits of the near-extreme cases.

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