MG11 
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Thermodynamic quantities of Kaluza-Klein black holes with squashed horizons

Recently, Ishihara and Matsuno studied spacetime structure of charged static blck holes in five-dimensional Einstein-Maxwell theory (hep-th/0510094).The black hole has one or two horizons in the shape of squashed three sphere. We investigate thermodynamic quantities of this black holes in terms of Euclidean formulation. If we take a Kaluza-Klein monopole (Gross-Perry,1983 and Sorkin, 1983) as a background spacetime, we obtain a non-trivial work term. We also discuss the case of other background spacetimes such as locally flat spacetime.