Outer trapped surfaces and their apparent horizon
- 1 March 1997
- journal article
- Published by AIP Publishing in Journal of Mathematical Physics
- Vol. 38 (3) , 1593-1604
- https://doi.org/10.1063/1.532010
Abstract
We give a new definition of “closed outer trapped surface’’ with respect to a hypersurface and show that the boundary of the trapped region (the apparent horizon) is a marginally trapped surface, i.e., has vanishing outer null expansion. While this is an important and well known result, there does not seem to exist a proof in the literature.Keywords
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