Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2007-12-27
Phys.Rev.D77:064030,2008
Physics
High Energy Physics
High Energy Physics - Theory
minor corrections, a ref. added
Scientific paper
10.1103/PhysRevD.77.064030
We discuss the entropy-area relation for the small black holes with higher curvature corrections by using the entropy function formalism and field redefinition method. We show that the entropy $S_{BH}$ of small black hole is proportional to its horizon area $A$. In particular we find a universal result that $S_{BH}=A/2G$, the ratio is two times of Bekenstein-Hawking entropy-area formula in many cases of physical interest. In four dimensions, the universal relation is always true irrespective of the coefficients of the higher-order terms if the dilaton couplings are the same, which is the case for string effective theory, while in five dimensions, the relation again holds irrespective of the overall coefficient if the higher-order corrections are in the GB combination. We also discuss how this result generalizes to known physically interesting cases with Lovelock correction terms in various dimensions, and possible implications of the universal relation.
Cai Rong-Gen
Chen Chiang-Mei
Maeda Kei--ichi
Ohta Nobuyoshi
Pang Da-Wei
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