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          Institute: MPI für Gravitationsphysik     Collection: Observational Relativity and Cosmology     Display Documents



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ID: 403603.0, MPI für Gravitationsphysik / Observational Relativity and Cosmology
Small-scale structure on a cosmic-string network
Authors:Allen, Bruce; Caldwell, R. R.
Date of Publication (YYYY-MM-DD):1991-03
Title of Journal:Physical Review D
Volume:43
Issue / Number:10
Start Page:3173
End Page:3187
Review Status:not specified
Audience:Not Specified
Abstract / Description:We construct an analytic model of the accumulation of small-scale structure on a cosmic-string network in an expanding universe. The structure is composed of kinks which form when the string segments cross and intercommute, and then decay from stretching and gravitational radiation back reaction. We calculate the linear density of kinks, K(t), for a general power-law expansion a(t)=(t / t0)p; after a period of rapid initial growth, the linear density approaches scaling K(t)∝t-1. We also examine the transition from the radiation- to matter-dominated eras; after the transition between eras, K(t) drops before settling once more into scaling. Because of the slow decay of kinks, we find that the kink density is many orders of magnitude larger than one might expect. The predictions of our model are in good quantitative agreement with the kink density observed in the numerical simulations. Our model may explain the observed lack of scaling behavior in the small-scale structure and in the formation of loops observed in numerical simulations.
External Publication Status:published
Document Type:Article
Communicated by:Bruce Allen
Affiliations:MPI für Gravitationsphysik/Teilinstitut Hannover
MPI für Gravitationsphysik/Observational Relativity and Cosmology
External Affiliations:Department of Physics, University of Wisconsin–Milwaukee, P.O. Box 413, Milwaukee, Wisconsin 53201, USA
Identifiers:ISSN:0556-2821
DOI:10.1103/PhysRevD.43.3173
URL:http://link.aps.org/doi/10.1103/PhysRevD.43.3173
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