Macroscopic and Microscopic Description of Black Diholes

Details Macroscopic and Microscopic Description of Black Diholes Macroscopic and Microscopic Description of Black Diholes

2001-04-24

arxiv.org/abs/hep-th/0104206v3

Nucl.Phys. B610 (2001) 190-214

Physics

High Energy Physics

High Energy Physics - Theory

29 pages, 3 figures, LaTeX; v2: reference added; v3: note added drawing attention to some early work on diholes

Scientific paper

10.1016/S0550-3213(01)00319-4

We study configurations consisting of a pair of non-extremal black holes in four dimensions, both with the same mass, and with charges of the same magnitude but opposite sign---diholes, for short. We present such exact solutions for Einstein-Maxwell theory with arbitrary dilaton coupling, and also solutions to the U(1)^4 theories that arise from compactified string/M-theory. Despite the fact that the solutions are very complicated, physical properties of these black holes, such as their area, charge, and interaction energy, admit simple expressions. We also succeed in providing a microscopic description of the entropy of these black holes using the `effective string' model, and taking into account the interaction between the effective string and anti-string.

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