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ID: 403058.0, MPI für Gravitationsphysik / Observational Relativity and Cosmology
Gravitational radiation from realistic cosmic string loops
Authors:Allen, Bruce; Casper, Paul
Date of Publication (YYYY-MM-DD):1995-10-15
Title of Journal:Physical Review D
Issue / Number:8
Start Page:4337
End Page:4348
Review Status:not specified
Audience:Not Specified
Abstract / Description:We examine the rates at which energy and momentum are radiated into gravitational waves by a large set of realistic cosmic string loops. The string loops are generated by numerically evolving parent loops with different initial conditions forward in time until they self-intersect, fragmenting into two child loops. The fragmentation of the child loops is followed recursively until only non-self-intersecting loops remain. The properties of the final non-self-intersecting loops are found to be independent of the initial conditions of the parent loops. We have calculated the radiated energy and momentum for a total of 11 625 stable child loops. We find that the majority of the final loops do not radiate significant amounts of spatial momentum. The velocity gained due to the rocket effect is typically small compared to the center-of-mass velocity of the fragmented loops. The distribution of gravitatoinal radiation rates in the center of mass frame of the loops, γ0≡(Gμ2)-1ΔE/Δτ, is strongly peaked in the range γ0=45–55; however, there are no loops found with γ0<40. Because the radiated spatial momentum is small, the distribution of gravitational radiation rates appears roughly the same in any reference frame. We conjecture that in the center-of-mass frame there is a lower bound γmin0>0 for the radiation rate from cosmic string loops. In a second conjecture, we identify a candidate for the loop with the minimal radiation rate and suggest that γmin0≃39.003.
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
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