Self-Similar Evaporation of a Rigidly-Rotating Cosmic String Loop

Details Self-Similar Evaporation of a Rigidly-Rotating Cosmic String Loop Self-Similar Evaporation of a Rigidly-Rotating Cosmic String Loop

2005-05-31

arxiv.org/abs/gr-qc/0505160v1

Class.Quant.Grav.22:2539-2568,2005

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

41 pages, 5 figures. Accepted for publication in Classical and Quantum Gravity

Scientific paper

10.1088/0264-9381/22/13/002

The gravitational back-reaction on a certain type of rigidly-rotating cosmic string loop, first discovered by Allen, Casper and Ottewill, is studied at the level of the weak-field approximation. The near-field metric perturbations are calculated and used to construct the self-acceleration vector of the loop. Although the acceleration vector is divergent at the two kink points on the loop, its net effect on the trajectory over a single oscillation period turns out to be finite. The net back-reaction on the loop over a single period is calculated using a method due to Quashnock and Spergel, and is shown to induce a uniform shrinkage of the loop while preserving its original shape. The loop therefore evolves by self-similar evaporation.

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