Equatorial circular orbits of neutral test particles in the Kerr--Newman spacetime
Abstract
We present a detailed analysis of the orbital circular motion of electrically neutral test particles on the equatorial plane of the Kerr-Newman spacetime. Many details of the motion in the cases of black hole and naked singularity sources are pointed out. We identify four different types of orbital regions, which depend on the properties of the orbital angular momentum, and define four different kinds of naked singularities, according to the values of the charge-to-mass ratio of the source. It is shown that the presence of a particular type of counter-rotating test particles is sufficient to uniquely identify naked singularities. It is pointed out that the structure of the stability regions can be used to differentiate between black holes and naked singularities.
Keywords
Cite
@article{arxiv.1303.6250,
title = {Equatorial circular orbits of neutral test particles in the Kerr--Newman spacetime},
author = {Daniela Pugliese and Hernando Quevedo and Remo Ruffini},
journal= {arXiv preprint arXiv:1303.6250},
year = {2013}
}
Comments
28 pages, 26 figures, 6 tables. This work follows the papers: DOI:10.1103/PhysRevD.84.044030; DOI:10.1103/PhysRevD.83.104052; DOI:10.1103/PhysRevD.83.024021 This is a revised version to meet the published article