Event horizons and apparent horizons in spherically symmetric geometries

Details Event horizons and apparent horizons in spherically symmetric geometries Event horizons and apparent horizons in spherically symmetric geometries

1994-02-11

arxiv.org/abs/gr-qc/9402024v1

Phys.Rev. D49 (1994) 6475-6483

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4, Poland July 1993, 24 pages, latex

Scientific paper

10.1103/PhysRevD.49.6475

Spherical configurations that are very massive must be surrounded by apparent horizons. These in turn, when placed outside a collapsing body, have a fixed area and must propagate outward with a velocity equal to the velocity of radially outgoing photons. That proves, within the framework of the (1+3) formalism and without resorting to the Birkhoff theorem, that apparent horizons coincide with event horizons in electrovacuum.

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