Relativity and Cosmology

    

Black Holes’ Edges Are not Like You Were Taught: Radial Null Geodesics in the Oppenheimer—Snyder Metric

Authors: Miquel Piñol

It is widely assumed that collapsing stars become black holes.It is also commonly accepted that the edge of a black hole, its so-called "event horizon", is a surface that can be crossed inward but not outward.However, a collapsing star is properly described by the Oppenheimer—Snyder metric, which corresponds to an eternal asymptotic process in Schwarzschild coordinates, and, as we show, its edge can be crossed outward, but not inward.

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[v1] 2025-09-27 13:01:43

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