Bulg. J. Phys. vol.28 no.5-6 (2001), pp. 200-208

Statistical Entropy of Axial Symmetry Einstein-Maxwell-Dilaton-Axion Black Hole

Zh. Ren, Zh. Junfang, Zh. Lichun
Department of Physics, Yanbei Normal Institute, 037000 Datong, P.R. China
Abstract. By using the method of quantum statistics, we directly derive the partition function of bosonic and fermionic field in axial symmetry Einstein-Maxwell-Dilaton-Axion black hole. Then via the improved brick-wall method, membrane model obtains that if we choose proper parameter, the entropy of black hole is proportional to the area of horizon. In our result, the stripped term and the divergent logarithmic term in the original brick-wall method no longer exist. In the whole process, we do not take any approximation. We offer a new simple and direct way of calculating the entropy of different complicated black holes.

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