Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.179..433b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 179, May 1977, p. 433-456.
Astronomy and Astrophysics
Astrophysics
1375
Black Holes (Astronomy), Electromagnetic Fields, Energy Sources, Rotating Matter, Active Galactic Nuclei, Astrophysics, Electron-Positron Pairs, Pair Production
Scientific paper
It is shown that if the magnetic field and angular momentum of a Kerr black hole are large enough, the vacuum surrounding the hole is unstable because any stray charged particles will be electrostatically accelerated and will radiate, with the radiation producing electron-positron pairs so freely that the electromagnetic field in the vicinity of the event horizon will become approximately force-free. Equations governing stationary force-free electromagnetic fields in Kerr spacetime are derived, and it is found that energy and angular momentum can be extracted from a rotating black hole by a purely electromagnetic mechanism. A perturbation technique is outlined for calculating approximate solutions under certain circumstances, and solutions are obtained for a split monopole magnetic field as well as for a paraboloidal magnetic field. The present concepts are applied to a model of an active galactic nucleus containing a massive black hole surrounded by an accretion disk.
Blandford Roger. D.
Znajek R. L.
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