Gravitational Scattering of Cosmic Strings by Non-Rotating Black Holes

Details Gravitational Scattering of Cosmic Strings by Non-Rotating Black Holes Gravitational Scattering of Cosmic Strings by Non-Rotating Black Holes

1998-12-04

arxiv.org/abs/gr-qc/9812016v4

Class.Quant.Grav. 16 (1999) 2403-2425

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

31 pages, 11 figures. Paper revised with referee comments. To appear in Classical and Quantum Gravity

Scientific paper

10.1088/0264-9381/16/7/317

This paper discusses the gravitational scattering of a straight, infinitely long test cosmic string by a black hole. We present numerical results that probe the two-dimensional parameter space of impact parameter and initial velocity and compare them to approximate perturbative solutions derived previously. We analyze string scattering and loop formation in the ultra-relativistic regime and compare these results with analytical results for string scattering by a gravitational shock wave. Special attention is paid to regimes where the string approaches the black hole at near-critical impact parameters. The dynamics of string scattering in this case are highly sensitive to initial data and transient phenomena arise while portions of the string dwell in the strong gravitational field near the event horizon of the black hole. The role of string tension is also investigated by comparing the scattering of a cosmic string to the scattering of a tensionless "dust" string. Finally, the problem of string capture is revisited in light of these new results, and a capture curve covering the entire velocity range ($0 < v \le c$) is given.

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