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Nature Physical Science

, Volume 229, Issue 6, pp 177–179 | Cite as

Extraction of Rotational Energy from a Black Hole

  • R. PENROSE
  • R. M. FLOYD
Article

Abstract

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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Copyright information

© Nature Publishing Group 1971

Authors and Affiliations

  • R. PENROSE
    • 1
  • R. M. FLOYD
    • 2
  1. 1.Department of MathematicsBirkbeck CollegeLondon
  2. 2.Willesden College of Technology and Department of MathematicsBirkbeck CollegeLondon

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