The angular momentum of a Kerr black hole

Details The angular momentum of a Kerr black hole The angular momentum of a Kerr black hole

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984cha%26a...8..277l&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 8, Issue 4, p. 277-282.

Astronomy and Astrophysics

Astrophysics

Scientific paper

It is pointed out that, when calculating the angular momentum of a Kerr black hole, we should allow for the effect of accretion of scattered electrons in the retrograde direction. By using the radius of smallest circular orbit of the particle as a measure for the capture cross-section by the hole, the calculation is greatly simplified. Thorne's result, a/M = 0.9982, when retrograde photons are considered, is easily obtained. If we allow for retrograde electrons, we get a/M = 0.9986, if we allow for both retrograde electrons and photons, we get a/M = 0.9968; and if we further allow for pair annihilation, we get a/M = 0.9961.

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