Static four-charge squashed black hole in five-dimensional $STU-W^{2}U$ supergravity and its thermodynamics

Abstract

In this paper, we present a remarkably simple expression for the exact solution to the $D=5$, $\mathcal{N}=2$ supergravity coupled to three vector multiplets with the prepotential $\mathcal{V}=STU-W^{2}U\equiv 1$, which represents a five-dimensional static Kaluza-Klein black hole with squashed $S^3$ horizons and four independent electric charges. It is asymptotically locally flat and has a spatial infinity $R\times S^1\hookrightarrow S^2$. We compute its conserved charges via the counterterm method and demonstrate that the thermodynamic quantities satisfy both the first law and Bekenstein-Smarr mass formula, provided the length of the compact extra dimension is treated as a thermodynamic variable.

10 pages, to appear in EPJC

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