Scattering of cosmic strings by black holes: loop formation

Details Scattering of cosmic strings by black holes: loop formation Scattering of cosmic strings by black holes: loop formation

2006-09-21

arxiv.org/abs/gr-qc/0609089v1

Int.J.Mod.Phys.D16:1311-1325,2007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

11 pages, 2 figures, RevTex

Scientific paper

10.1142/S0218271807010778

We study the deformation of a long cosmic string by a nearby rotating black hole. We examine whether the deformation of a cosmic string, induced by the gravitational field of a Kerr black hole, may lead to the formation of a loop of cosmic string. The segment of the string which enters the ergosphere of a rotating black hole gets deformed and, if it is sufficiently twisted, it can self-intersect chopping off a loop of cosmic string. We find that the formation of a loop, via this mechanism, is a rare event. It will only arise in a small region of the collision phase space, which depends on the string velocity, the impact parameter and the black hole angular momentum. We conclude that generically, the cosmic string is simply scattered or captured by the rotating black hole.

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