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  Gravitational radiation from cosmic strings

Allen, B., & Shellard, E. P. S. (1992). Gravitational radiation from cosmic strings. Physical Review D, 45(6), 1898-1912. doi:10.1103/PhysRevD.45.1898.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-5CA7-3 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-5CA8-1
Genre: Journal Article

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prd45-1898.pdf (Publisher version), 3MB
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Allen, Bruce1, Author              
Shellard, E. P. S., Author
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1Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, escidoc:24011              

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 Abstract: A cosmic-string network in an expanding universe evolves by losing energy to loops which in turn oscillate and emit gravitational radiation. The power radiated at a frequency corresponding to the nth fundamental mode of oscillation of the loop is characterized by a dimensionless constant Pn, with the total power radiated being proportional to γ=ΣPn. Previously, these constants were estimated by analytic or numerical analysis in idealized situations, generally for simple loop shapes. Here, we determine these constants more realistically, for loops produced in a numerical simulation of the cosmic-string network. The resulting numerical values of the Pn appear to show a linear dependence on loop size, indicating that small-scale structure on the loops is very important in determining the overall radiation power. Long-string radiation is also studied, confirming this conclusion. The power radiated by a horizon-length string increases with time, because in the current simulations the small-scale structure on the string does not yet scale relative to the horizon length. With an appropriate extrapolation one can conclude that gravitational radiation from the long-string network will provide a significant energy-loss mechanism and may occur at a rate roughly comparable to energy loss due to loop formation.

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 Dates: 1992
 Publication Status: Published in print
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Title: Physical Review D
Source Genre: Journal
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Pages: - Volume / Issue: 45 (6) Sequence Number: - Start / End Page: 1898 - 1912 Identifier: ISSN: 0556-2821