Warped-AdS3 black holes with scalar halo

TL;DR

This paper constructs a new class of 3D warped AdS black holes supported by a scalar field with non-minimal coupling, exploring their thermodynamics and potential dual CFT descriptions.

Contribution

It introduces warped AdS3 black holes with scalar halos supported by non-minimally coupled scalar fields, extending the understanding of such solutions and their thermodynamic properties.

Findings

Black holes have finite temperature and entropy.

Scalar field coupling can be of Horndeski type, yielding second order equations.

Potential dual description in warped conformal field theory.

Abstract

We construct a stretched (aka Warped) Anti-de Sitter black hole in 3 dimensions supported by a real scalar field configuration. The latter is regular everywhere outside and on the horizon. No hair theorems in 3 dimensions demand the matter to be coupled to the curvature in a non-minimal way; however, this coupling can still be of the Horndeski type, i.e. yielding second order field equations similar to those appearing in the context of Galileon theories. These Warped-Anti-de Sitter black holes exhibit interesting thermodynamical properties, such as finite Hawking temperature and entropy. We compute the black hole entropy in the gravity theory and speculate with the possibility of this to admit a microscopic description in terms of a dual (Warped) Conformal Field Theory. We also discuss the inner and outer black hole mechanics.