Can Extremal Black Holes Have Non-Zero Entropy ?

Details Can Extremal Black Holes Have Non-Zero Entropy ? Can Extremal Black Holes Have Non-Zero Entropy ?

1996-08-23

arxiv.org/abs/hep-th/9608162v3

Mod.Phys.Lett.A12:3067-3080,1997

Physics

High Energy Physics

High Energy Physics - Theory

18 pages, RevTEX; last section modified, version to appear in Mod. Phys. Lett. A

Scientific paper

10.1142/S0217732397003186

We give several pieces of evidence to show that extremal black holes cannot be obtained as limits of non-extremal black holes. We review arguments in the literature showing that the entropy of extremal black holes is zero, while that of near-extremal ones obey the Bekenstein-Hawking formula. However, from the counting of degeneracy of quantum (BPS) states of string theory the entropy of extremal stringy black holes obeys the area law. An attempt is made to reconcile these arguments.

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