Phys. Rev. D 7, 2311–2316 (1973)General Theory of Vacuum ErgospheresReceived 27 September 1971; published in the issue dated 15 April 1973 A general definition of ergosphere is given abstracting this sort of energy source from any particular solution of Einstein's equations. A classification of ergosphere boundary points is performed according to their local properties. Points of both classes are shown to be present on the boundary of a large subfamily of ergospheres called weakly bounded. This implies existence of a singularity or a black hole inside these ergospheres. Both known ergospheres, that for v=Hr and that for r in the Kerr solution, are weakly bounded. © 1973 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.7.2311
DOI:
10.1103/PhysRevD.7.2311
PACS:
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