Analytic and exponentially localized brane-world Reissner-Nordstr\"{o}m-AdS solution: a top-down approach

TL;DR

This paper constructs a five-dimensional charged black hole with a localized singularity on the brane, analyzing its geometry, matter content, and the effective four-dimensional gravitational equations, revealing a tidal charge effect.

Contribution

It presents a novel top-down construction of a localized Reissner-Nordström-AdS black hole in a brane-world scenario with detailed horizon classification and matter modeling.

Findings

Horizons are exponentially localized near the brane.

Bulk geometry is regular and reduces to AdS outside the horizon.

The brane's Reissner-Nordström-(A)dS geometry is due to bulk effects and matter, with charge as a tidal charge.

Abstract

In this work, we construct a five-dimensional spherically-symmetric, charged and asymptotically Anti-de Sitter black hole with its singularity being point-like and strictly localised on our brane. In addition, the induced brane geometry is described by a Reissner-Nordstr\"{o}m-(A)dS line-element. We perform a careful classification of the horizons, and demonstrate that all of them are exponentially localised close to the brane thus exhibiting a pancake shape. The bulk gravitational background is everywhere regular, and reduces to an AdS$_5$ spacetime right outside the black-hole event horizon. This geometry is supported by an anisotropic fluid with only two independent components, the energy density $\rho_E$ and tangential pressure $p_2$. All energy conditions are respected close to and on our brane, but a local violation takes place within the event horizon regime in the bulk. A tensor-vector-scalar field-theory model is built in an attempt to realise the necessary bulk matter, however, in order to do so, both gauge and scalar degrees of freedom need to turn phantom-like at the bulk boundary. The study of the junction conditions reveals that no additional matter needs to be introduced on the brane for its consistent embedding in the bulk geometry apart from its constant, positive tension. We finally compute the effective gravitational equations on the brane, and demonstrate that the Reissner-Nordstr\"{o}m-(A)dS geometry on our brane is caused by the combined effect of the five-dimensional geometry and bulk matter with its charge being in fact a tidal charge.