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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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Datensatz-Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-5CA7-3 Versions-Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-5CA8-1
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 Urheber:
Allen, Bruce1, Autor              
Shellard, E. P. S., Autor
Affiliations:
1Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24011              

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 Zusammenfassung: 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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 Datum: 1992
 Publikationsstatus: Im Druck publiziert
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Titel: Physical Review D
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 45 (6) Artikelnummer: - Start- / Endseite: 1898 - 1912 Identifikator: ISSN: 0556-2821