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

TL;DR

This paper derives an exact, simple solution for a five-dimensional static squashed black hole with four electric charges in a specific supergravity model, analyzing its thermodynamics and conserved charges.

Contribution

It provides a new explicit solution for a five-dimensional black hole with squashed horizons in supergravity, including thermodynamic analysis with the extra dimension as a variable.

Findings

The solution is exact and remarkably simple.

Thermodynamic quantities satisfy the first law and Bekenstein-Smarr relation.

The conserved charges are computed via the counterterm method.

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 $\mathcal{V} = STU -W^2U \equiv 1$, 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.