Cosmological stretching of perturbations on a cosmic string

Details Cosmological stretching of perturbations on a cosmic string Cosmological stretching of perturbations on a cosmic string

2003-12-22

arxiv.org/abs/gr-qc/0312101v2

JCAP 0405 (2004) 003

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

11 pages, 5 postscript figures

Scientific paper

10.1088/1475-7516/2004/05/003

We investigate the effects of cosmological expansion on the spectrum of small-scale structure on a cosmic string. We simulate the evolution of a string with two modes that differ in wavelength by one order of magnitude. Once the short mode is inside the horizon, we find that its physical amplitude remains unchanged, in spite of the fact that its comoving wavelength decreases as the longer mode enters the horizon. Thus the ratio of amplitude to wavelength for the short mode becomes larger than it would be in the absence of the long mode.

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