Formation of Three-Dimensional Black Strings from Gravitational Collapse of Dust Cloud

Details Formation of Three-Dimensional Black Strings from Gravitational Collapse of Dust Cloud Formation of Three-Dimensional Black Strings from Gravitational Collapse of Dust Cloud

2006-12-15

arxiv.org/abs/gr-qc/0612094v4

JHEP 0704:088,2007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

LaTeX, 13 pages, 6 figures, matches published version

Scientific paper

10.1088/1126-6708/2007/04/088

We study the formation of black strings from a gravitational collapse of cylindrical dust clouds in the three-dimensional low-energy string theory. New junction conditions for the dilaton as well as two junction conditions for metrics and extrinsic curvatures between both regions of the clouds are presented. As a result, it is found that the collapsing dust cloud always collapses to a black string within a finite collapse time, and then a curvature singularity formed at origin is cloaked by an event horizon. Moreover, it is also shown that the collapse process can form a naked singularity within finite time, regardless of the choice of initial data.

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