Gravitational waves from global cosmic strings in quintessential inflation

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http://hdl.handle.net/10138/315076

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Bettoni , D , Domenech , G & Rubio , J 2019 , ' Gravitational waves from global cosmic strings in quintessential inflation ' , Journal of Cosmology and Astroparticle Physics , vol. 2019 , no. 2 , 034 . https://doi.org/10.1088/1475-7516/2019/02/034

Title: Gravitational waves from global cosmic strings in quintessential inflation
Author: Bettoni, Dario; Domenech, Guillem; Rubio, Javier
Contributor: University of Helsinki, Helsinki Institute of Physics
Date: 2019-02
Language: eng
Number of pages: 22
Belongs to series: Journal of Cosmology and Astroparticle Physics
ISSN: 1475-7516
URI: http://hdl.handle.net/10138/315076
Abstract: The combination of non-minimal couplings to gravity with the post-inflationary kinetic-dominated era typically appearing in quintessential inflation scenarios may lead to the spontaneous symmetry breaking of internal symmetries and its eventual restoration at the onset of radiation domination. On general grounds, the breaking of these symmetries leads to the generation of short-lived topological defects that tend to produce gravitational waves until the symmetry is restored. We study here the background of gravitational waves generated by a global cosmic string network following the dynamical symmetry breaking and restoration of a U(1) symmetry. The resulting power spectrum depends on the duration of the heating process and it is potentially detectable, providing a test on the existence of non-minimal couplings to gravity and the characteristic energy scale of post-inflationary physics.
Subject: Cosmic strings
domain walls
monopoles
inflation
physics of the early universe
primordial gravitational waves (theory)
EVOLUTION
CREATION
UNIVERSE
SPECTRUM
115 Astronomy, Space science
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