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Light from cosmic strings
Steer D.A., Vachaspati T.
Physical Review D 83 (2011) 43528 - http://hal.archives-ouvertes.fr/hal-00716532
Physique/Physique des Hautes Energies - Théorie
Light from cosmic strings
D.A. Steer1, T. Vachaspati
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
The time-dependent metric of a cosmic string leads to an effective interaction between the string and photons--the "gravitational Aharonov-Bohm" effect--and causes cosmic strings to emit light. We evaluate the radiation of pairs of photons from cosmic strings and find that the emission from cusps, kinks and kink-kink collisions occurs with a flat spectrum at all frequencies up to the string scale. Further, cusps emit a beam of photons, kinks emit along a curve, and the emission at a kink-kink collision is in all directions. The emission of light from cosmic strings could provide an important new observational signature of cosmic strings that is within reach of current experiments for a range of string tensions.

Physical Review D (Phys. Rev. D)
Publisher American Physical Society
ISSN 1550-7998 (eISSN : 1550-2368)
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