Effect of charge on negative-phase-velocity propagation of electromagnetic waves in the ergosphere of a rotating black hole
arXiv:astro-ph/0608412 · doi:10.1016/j.ijleo.2008.05.026
Abstract
The presence of charge promotes the propensity of a rotating black hole to support the propagation of electromagnetic plane waves with negative phase velocity (NPV) in its ergosphere, whether the Kerr-Newman or the Kerr-Sen metric descriptions of spacetime are considered. Striking differences in the NPV characteristics for the Kerr-Newman and Kerr-Sen metrics emerge from numerical studies, particularly close to the outer event horizon when the magnitude of the charge is large.
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