Entropy function and universality of entropy-area relation for small black holes

Rong Gen Cai*, Chiang Mei Chen, Kei Ichi Maeda, Nobuyoshi Ohta, Da Wei Pang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


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 SBH of the small black hole is proportional to its horizon area A. In particular, we find a universal result that SBH=A/2G, the ratio is 2 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.

Original languageEnglish
Article number064030
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number6
Publication statusPublished - 2008 Mar 28

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)


Dive into the research topics of 'Entropy function and universality of entropy-area relation for small black holes'. Together they form a unique fingerprint.

Cite this