Charged Particles Circular Orbits around Weakly Charged and Magnetized Kerr Black Holes

TL;DR

This paper analyzes how electromagnetic forces influence the circular orbits of charged particles around weakly charged and magnetized Kerr black holes, with implications for accretion disk structures.

Contribution

It provides a detailed study of charged particle orbits in weakly charged and magnetized Kerr black hole spacetimes, including effects on stability and accretion disk features.

Findings

Electromagnetic forces alter the innermost stable circular orbits.

Negative-energy stable orbits can exist under certain conditions.

Possible formation of gaps or double orbits in accretion disks.

Abstract

We study the circular orbits of charged particles around a weakly charged Kerr black hole immersed in a weak, axisymmetric magnetic field. Firstly, we review the circular orbits of neutral particles. We then review the circular orbits of charged particles around a weakly charged Kerr black hole and weakly magnetized Kerr black hole. The case of a weakly magnetized and charged black hole is investigated thereafter. We investigate, in particular, the effect of the electromagnetic forces on the charged particles' innermost stable circular orbits. We examine the conditions for the existence of negative-energy stable circular orbits and the possibility of the emergence of a gap or double orbit in thin accretion disks. Some of the interesting astrophysical consequences of our findings are discussed as well.