Mass and Thermodynamics of Kaluza-Klein Black Holes with Squashed Horizons
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Recently a five-dimensional Kaluza-Klein black hole solution with squashed horizon has been found in hep-th/0510094. The black hole spacetime is asymptotically locally flat and has a spatial infinity $S^1 \hookrightarrow S^{2}$. By using "boundary counterterm" method and generalized Abbott-Deser method, we calculate the mass of this black hole. When an appropriate background is chosen, the generalized Abbott-Deser method gives the same mass as the "boundary counterterm" method. The mass is found to satisfy the first law of black hole thermodynamics. The thermodynamic properties of the Kaluza-Klein black hole are discussed and are compared to those of its undeformed counterpart, a five-dimensional Reissner-Nordström black hole.
Latex, 11 pages including two eps figures, two more references added, minor changes, to appear in PLB
Latex, 11 pages including two eps figures, two more references added, minor changes, to appear in PLB