paper

Generic Isolated Horizons and their Applications

arXiv:gr-qc/0006006 · doi:10.1103/PhysRevLett.85.3564

Abstract

Boundary conditions defining a generic isolated horizon are introduced. They generalize the notion available in the existing literature by allowing the horizon to have distortion and angular momentum. Space-times containing a black hole, itself in equilibrium but possibly surrounded by radiation, satisfy these conditions. In spite of this generality, the conditions have rich consequences. They lead to a framework, somewhat analogous to null infinity, for extracting physical information, but now in the \textit{strong} field regions. The framework also generalizes the zeroth and first laws of black hole mechanics to more realistic situations and sheds new light on the `origin' of the first law. Finally, it provides a point of departure for black hole entropy calculations in non-perturbative quantum gravity.

4 pages, RevTeX. Minor typos were corrected and the fact that, in contrast to Ref [4], isolated horizons are now allowed to have distortion and rotation was clarified

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