Solution Independent Analysis of Black Hole Entropy in Brick Wall Model

Details Solution Independent Analysis of Black Hole Entropy in Brick Wall Model Solution Independent Analysis of Black Hole Entropy in Brick Wall Model

2005-05-26

arxiv.org/abs/gr-qc/0505129v2

Class.Quant.Grav.22:3923-3934,2005

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

19 pages

Scientific paper

10.1088/0264-9381/22/19/008

Using the brick wall regularization of 't Hooft, the entropy of non-extreme and extreme black holes is investigated in a general static, spherically symmetric spacetime. We classify the singularity in the entropy by introducing a {\it new} index $\delta $ with respect to the brick wall cut-off $\epsilon $. The leading contribution to entropy for non-extreme case $(\delta \neq 0)$ is shown to satisfy the area law with quadratic divergence with respect to the invariant cut-off $\epsilon_{{\rm inv}}$ while the extreme case $(\delta =0)$ exhibits logarithmic divergence or constant value with respect to $\epsilon $. The general formula is applied to Reissner-Nordstr\"{o}m, dilaton and brane-world black holes and we obtain consistent results.

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