Abstract
The Penrose-Gibbons inequality for charged black holes is proved in spherical symmetry, assuming that outside the black hole there are no current sources, meaning that the charge is constant, with the remaining fields satisfying the dominant energy condition. Specifically, for any achronal hypersurface which is asymptotically flat at spatial or null infinity and has an outermost marginal surface of areal radius , the asymptotic mass satisfies . Replacing by a local energy , the inequality holds locally outside the black hole. A recent definition of dynamic surface gravity also satisfies inequalities and . All these inequalities are sharp in the sense that equality is attained for the Reissner-Nordström black hole.
- Received 14 July 1998
DOI:https://doi.org/10.1103/PhysRevLett.81.4557
©1998 American Physical Society