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, 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.

4, Poland July 1993, 24 pages, latex

References in corpus (1)

• Trapped surfaces and spherical closed cosmologies

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• Towards a Supersymmetric Generalization of the Schwarzschild Black Hole
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• Investigations on hoop conjecture for horizonless spherical charged stars
• On the local existence of maximal slicings in spherically symmetric spacetimes
• A unified hoop conjecture for black holes and horizonless compact stars