On the proximity of black hole horizons: lessons from Vaidya

Details On the proximity of black hole horizons: lessons from Vaidya On the proximity of black hole horizons: lessons from Vaidya

2010-07-09

arxiv.org/abs/1007.1642v3

Phys.Rev.D82:124046,2010

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

15 pages, 7 figures; Version 2: minor typos corrected and a couple of references added; Version 3: To appear in PRD. Largest c

Scientific paper

10.1103/PhysRevD.82.124046

In dynamical spacetimes, apparent and event horizons do not coincide. In this paper we propose a geometrical measure of the distance between those horizons and investigate it for the case of the Vaidya spacetime. We show that it is well-defined, physically meaningful, and has the expected behaviour in the near-equilibrium limit. We consider its implications for our understanding of black hole physics.

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