Analytic solutions in the dyon black hole with a cosmic string: scalar fields, Hawking radiation and energy flux

TL;DR

This paper derives exact analytical solutions for scalar fields around a dyonic black hole with a cosmic string, analyzing Hawking radiation and energy flux using confluent Heun functions.

Contribution

It provides new exact solutions for scalar fields in this complex black hole spacetime, highlighting the impact of the cosmic string.

Findings

Exact solutions in terms of confluent Heun functions

Analysis of Hawking radiation spectrum

Impact of cosmic string on scalar field solutions

Abstract

Charged massive scalar fields are considered in the gravitational and electromagnetic field produced by a dyonic black hole with a cosmic string along its axis of symmetry. Exact solutions of both angular and radial parts of the covariant Klein-Gordon equation in this background are obtained, and are given in terms of the confluent Heun functions. The role of the presence of the cosmic string in these solutions is showed up. From the radial solution, we obtain the exact wave solutions near the exterior horizon of the black hole, and discuss the Hawking radiation spectrum and the energy flux.