Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
1998-07-19
Phys.Lett. B432 (1998) 69-73
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
Latex version, to be published on Phys.Lett.B
Scientific paper
10.1016/S0370-2693(98)00642-X
According to different topological configurations, we suggest that there are two kinds of extreme black holes in the nature. We find that the Euler characteristic plays an essential role to classify these two kinds of extreme black holes. For the first kind of extreme black holes, Euler characteristic is zero, and for the second kind, Euler characteristic is two or one provided they are four dimensional holes or two dimensional holes respectively.
Su Ru-Keng
Wang Bin
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