Abstract
We perform numerical simulations of the gravitational collapse of a k-essence scalar field. When the field is sufficiently strongly gravitating, a black hole forms. However, the black hole has two horizons: a light horizon (the ordinary black hole horizon) and a sound horizon that traps k-essence. In certain cases the k-essence signals can travel faster than light and the sound horizon is inside the light horizon. Under those circumstances, k-essence signals can escape from the black hole. Eventually, the two horizons merge and the k-essence signals can no longer escape.
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ArXiv ePrint: 1103.0290
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Akhoury, R., Garfinkle, D. & Saotome, R. Gravitational collapse of k-essence. J. High Energ. Phys. 2011, 96 (2011). https://doi.org/10.1007/JHEP04(2011)096
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DOI: https://doi.org/10.1007/JHEP04(2011)096