C-metric with a conformally coupled scalar field in a magnetic universe

TL;DR

This paper explores new black hole solutions in Einstein-Maxwell gravity with a conformally coupled scalar field, addressing limitations of previous models by introducing magnetised, accelerating, and rotating black holes in a magnetic universe.

Contribution

It proposes a new class of black hole solutions with conformal scalar fields, including rotating cases, overcoming previous model limitations in magnetic universes.

Findings

Black holes in this model can be magnetised and accelerated.

New solutions include rotating black holes with conformal scalar fields.

The models address stability and physical plausibility issues of earlier solutions.

Abstract

In Einstein-Maxwell gravity with a conformally coupled scalar field, the black hole found by Bocharova, Bronnikov, Melnikov, and Bekenstein breaks when embedded in the external magnetic field of the Melvin universe. The situation improves in presence of acceleration, allowing one to build magnetised and accelerating BBMB black hole with a thin membrane. But to overcome this and others disadvantages of BBMB spacetimes, a new class of black holes, including the rotating case, is proposed for the conformal matter coupling under consideration.