Phantom Black Holes in Einstein-Maxwell-Dilaton Theory

TL;DR

This paper derives new static, spherically symmetric black hole solutions in Einstein-Maxwell-dilaton theory with phantom couplings, revealing novel horizon structures and causal diagrams, expanding understanding of exotic black hole configurations.

Contribution

It provides the first general solutions for phantom Einstein-Maxwell-dilaton systems, uncovering new classes of black holes with unique horizon and causal properties.

Findings

New black hole solutions with single or multiple horizons

Identification of novel causal structures via Penrose diagrams

Extension of black hole solution space with phantom couplings

Abstract

We obtain the general static, spherically symmetric solution for the Einstein-Maxwell-dilaton system in four dimensions with a phantom coupling for the dilaton and/or the Maxwell field. This leads to new classes of black hole solutions, with single or multiple horizons. Using the geodesic equations, we analyse the corresponding Penrose diagrams revealing, in some cases, new causal structures.