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

1993-01-06

arxiv.org/abs/gr-qc/9301002v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

5 pages, plaintex

Scientific paper

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

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