Gravitational collapse of K-essence Matter in Painlevé-Gullstrand coordinates

Details Gravitational collapse of K-essence Matter in Painlevé-Gullstrand coordinates Gravitational collapse of K-essence Matter in Painlevé-Gullstrand coordinates

2011-06-10

arxiv.org/abs/1106.2054v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

14 pages, 8 figures

Scientific paper

We conduct numerical simulations in Painlev\'{e}-Gullstrand coordinates of a variety of K-essence-type scalar fields under spherically symmetric gravitational collapse. We write down generic conditions on the K-essence lagrangian that can be used to determine whether superluminality and Cauchy breakdown are possible. Consistent with these conditions, for specific choices of K-essence-type fields we verify the presence of superluminality during collapse, while for other type we do not. We also demonstrate that certain choices of K-essence scalar fields present issues under gravitational collapse in Painlev\'{e}-Gullstrand coordinates, such as a breakdown of the Cauchy problem.

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