THERE has been considerable interest recently in the question of the gravitational collapse of a massive body and of the possible astrophysical consequences of the existence of the “black hole” which general relativity predicts should sometimes be the result of such a collapse. In particular, the question has arisen whether the mass-energy content of a black hole could, under suitable circumstances, be a source of available energy. We now consider the extraction of rotational energy from a black hole, not least because the rotational energy (defined appropriately) of a black hole should, in general, be comparable with its total mass-energy1.
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About this article
Nature Astronomy (2019)
Journal of Astrophysics and Astronomy (2019)
General Relativity and Gravitation (2019)
Living Reviews in Relativity (2018)
Journal of Astrophysics and Astronomy (2018)