Phantom Black Holes and Sigma Models

TL;DR

This paper constructs novel regular black hole solutions in phantom Einstein-Maxwell-dilaton theories using null geodesics, and explores their generation via group transformations in reduced sigma models, revealing new insights into phantom gravity solutions.

Contribution

It introduces a method to generate regular black holes without spatial symmetry in phantom theories and analyzes their structure through reduced sigma models, expanding the landscape of phantom gravity solutions.

Findings

Regular black holes without spatial symmetry constructed

Solutions derived from null geodesics of the target space

Generation of phantom charged black holes via group transformations

Abstract

We construct static multicenter solutions of phantom Einstein-Maxwell-dilaton theory from null geodesics of the target space, leading to regular black holes without spatial symmetry for certain discrete values of the dilaton coupling constant. We also discuss the three-dimensional gravitating sigma models obtained by reduction of phantom Einstein-Maxwell, phantom Kaluza-Klein and phantom Einstein-Maxwell-dilaton-axion theories. In each case, we generate by group transformations phantom charged black hole solutions from a neutral seed.