Electric Charge and Magnetic Flux on Rotating Black Holes in a Force-Free Magnetosphere

Abstract

The electric charge on rotating black holes is calculated to be ~ BJ in the force-free configuration of Ghosh (2000), with a horizon flux of ~ BM^2. This charge is gravitationally weak for B ~ 10^{15} G, so that the Kerr metric applies. Being similar to the electric charge of a magnetar, both electric charge and magnetic flux should be, in sign and order of magnitude, continuous during stellar collapse into a black hole. Extraction of the rotational energy from newly formed black holes may proceed by interaction with the magnetic field. Keywords:black hole physics --magnetic fields

11 pages, no figure, restructured with sections and revisions in abstarct and in the text, version accepted for MNRAS

References in corpus (5)

• The Blandford-Znajek Process as a Centeral Engine for a Gamma Ray Burst
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• The structure of black hole magnetospheres. I. Schwarzschild black holes
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