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Formation of three-dimensional black strings from gravitational collapse of dust cloud

Seungjoon Hyun1,3, Jaehoon Jeong1, Wontae Kim2,3 and John J. Oh1

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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.

Keywords

Classical Theories of Gravity

Spacetime Singularities

Black Holes in String Theory

 

E-print Number: gr-qc/0612094

Cited: by |

Refers: to

PACS

11.25.-w Strings and branes

04.20.Dw Singularities and cosmic censorship

04.25.-g Approximation methods; equations of motion

04.70.-s Physics of black holes

Subjects

Gravitation and cosmology

Particle physics and field theory

Dates

Issue 04 (April 2007)

Received 15 December 2006, accepted for publication 10 April 2007

Published 30 April 2007



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