Emission of gravitational waves by superconducting cosmic strings
Abstract
We study the gravitational radiation emission efficiency Γ of superconducting cosmic strings. We demonstrate, by using a solvable model of transonic strings, that the presence of a current leads to a suppression of the gravitational emission of cusps, kinks and different types of loops. We also show that, when a current is present, the spectrum of emission of loops with cusps is exponentially suppressed as the harmonic mode increases, thus being significantly different from the power law spectrum of currentless loops. Furthermore, we establish a phenomenological relationship between Γ and the value of the current on cosmic strings. We conjecture that this relation should be valid for an arbitrary type of currentcarrying string. We use this result to study the potential impact of current on the stochastic gravitational wave background generated by cosmic strings with additional degrees of freedom and show that both the amplitude and shape of the spectrum may be significantly affected.
 Publication:

Journal of Cosmology and Astroparticle Physics
 Pub Date:
 November 2022
 DOI:
 10.1088/14757516/2022/11/024
 arXiv:
 arXiv:2209.01068
 Bibcode:
 2022JCAP...11..024R
 Keywords:

 Cosmic strings;
 domain walls;
 monopoles;
 gravitational waves / sources;
 General Relativity and Quantum Cosmology;
 Astrophysics  Cosmology and Nongalactic Astrophysics;
 High Energy Physics  Phenomenology
 EPrint:
 27 pages, 9 figures