Scattering of cosmic strings by black holes: loop formation

Abstract

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.

11 pages, 2 figures, RevTex

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• Spinning black holes as cosmic string factories
• Gravitational Interactions of Finite Thickness Global Topological Defects with Black Holes
• Simulating cosmic string loop captured by a rotating black hole
• Null Cosmic Strings: Scattering by Black Holes, Optics and Spacetime Content
• Investigating the interaction of a Cosmic String with an Accreting Black Hole
• Blandford-Znajek Jets and the Total Angular Momentum Evolution of a Black Hole Connected to a Cosmic String