Event horizons and apparent horizons in spherically symmetric geometries

Abstract

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.

5 pages, plaintex

References in corpus (1)

• Trapped surfaces and spherical closed cosmologies

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