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Gravitational wave signatures from kink proliferation on cosmic (super-) strings
Binétruy P., Bohé A., Hertog T., Steer D.A.
Physical Review D 82 (2010) 126007 - http://hal.archives-ouvertes.fr/hal-00716533
Physique/Relativité Générale et Cosmologie Quantique
Physique/Physique des Hautes Energies - Théorie
Gravitational wave signatures from kink proliferation on cosmic (super-) strings
P. Binétruy1, A. Bohé2, T. Hertog1, 3, D.A. Steer1
1 :  APC - UMR 7164 - AstroParticule et Cosmologie
CNRS : UMR7164 – IN2P3 – Observatoire de Paris – Université Paris VII - Paris Diderot – CEA : DSM/IRFU
APC - UMR 7164, Université Paris Diderot, 10 rue Alice Domon et Léonie Duquet, case postale 7020, F-75205 Paris Cedex 13
2 :  IAP - Institut d'Astrophysique de Paris
CNRS : UMR7095 – INSU – Université Pierre et Marie Curie (UPMC) - Paris VI
98bis, bd Arago - 75014 Paris France
3 :  International Solvay Institutes
International Solvay Institutes
Boulevard du Triomphe ULB-C.P.231, B-1050 Brussels
Junctions on cosmic string loops give rise to the proliferation of sharp kinks. We study the effect of this proliferation on the gravitational wave (GW) signals emitted from string networks with junctions, assuming a scaling solution. We calculate the rate of occurrence and the distribution in amplitude of the GW bursts emitted at cusps and kinks in the frequency bands of LIGO/VIRGO and LISA as a function of the string tension, the number of sharp kinks on loops with junctions, and the fraction of loops in the cosmological network which have junctions. Combining our results with current observational constraints, we find that pulsar data rule out a significant number of kinks on loops for strings with tensions Gμ≳10-12. By contrast, for smaller tensions current observations allow for a large number of kinks on loops. If this is the case, the incoherent superposition of small bursts emitted at kink-kink encounters leads to an enhanced GW background that hides the strong individual bursts from kinks and cusps.

Physical Review D (Phys. Rev. D)
Publisher American Physical Society
ISSN 1550-7998 (eISSN : 1550-2368)
Articles dans des revues avec comité de lecture

Wave generation and sources – Extended classical solutions – cosmic strings – domain walls – texture
32 pages, 13 figures

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