Anti de Sitter 5D black hole solutions with a self-interacting bulk scalar field: a potential reconstruction approach

TL;DR

This paper constructs asymptotically AdS 5D black hole solutions with a self-interacting scalar field, analyzing scalar profiles and potential forms, and providing semi-analytical and numerical characterizations of these solutions.

Contribution

It introduces a potential reconstruction approach to find new 5D AdS black hole solutions with scalar hair, including semi-analytical expressions for key functions.

Findings

Scalar field profiles decay exponentially or as inverse power.

Potential V(phi) has a non-convex form consistent with no-hair theorems.

Numerical solutions illustrate the properties of the constructed black holes.

Abstract

We construct asymptotically AdS black hole solutions, with a self-interacting bulk scalar field, in the context of 5D general relativity. As the observable universe is characterized by spatial flatness, we focus to solutions where the horizon of the black hole, and subsequently all 3D hypersurfaces for fixed radial coordinate,have zero spatial curvature. We examine two cases for the black hole scalar hair: a) an exponential decaying scalar field profile and b) an inverse power scalar field profile. The scalar black hole solutions we present in this paper, are characterized by four functions f(r), a(r), phi(r) and V(phi(r)). Only the functions phi(r) and a(r) are determined analytically, while the functions f(r) and V(phi(r)) are expressed semi-analytically, by integral formulas in terms of a(r). We present our numerical results in figures and we study in detail the characteristic properties of our solutions. We also note that the potential we obtain has a non-convex form in agreement with the corresponding "no hair theorem" for AdS space-times.