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Abstract: In this lecture I give an introduction to the rotational energy extraction ofblack holes by the electromagnetic Blandford-Znajek process and the generationof relativistic jets. After some basic material on the electrodynamics of blackhole magnetospheres, we derive the most important results of Blandford andZnajek by making use of Kerr-Schild coordinates, which are regular on thehorizon. In a final part we briefly describe results of recent numericalsimulations of accretion flows on rotating black holes, the resultinglarge-scale outflows, and the formation of collimated relativistic jets withhigh Lorentz factors.

Autor: Norbert Straumann


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