Confinement by Black Holes

Details Confinement by Black Holes Confinement by Black Holes

1994-05-25

arxiv.org/abs/gr-qc/9405055v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

5 pages. Figures not included

Scientific paper

The question of whether an observer can escape from a black hole is addressed, using a recent general definition of a black hole in the form of a future outer trapping horizon. An observer on a future outer trapping horizon must enter the neighbouring trapped region. It is possible for the observer to subsequently escape from the trapped region. However, if the horizon separates the space-time into two disjoint components, inside and outside the horizon, then an observer inside a future outer trapping horizon cannot get outside, assuming the null energy condition. A similar confinement property holds for trapped, locally area-preserving cylinders, as suggested by Israel.

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