Probing leptogenesis and pre-BBN universe with gravitational waves spectral shapes

0554713 - FZÚ 2022 RIV US eng J - Journal Article
Samanta, Rome - Datta, S.
Probing leptogenesis and pre-BBN universe with gravitational waves spectral shapes.
Journal of High Energy Physics. Roč. 2021, č. 11 (2021), č. článku 017. ISSN 1029-8479. E-ISSN 1029-8479
R&D Projects: GA MŠMT(CZ) EF20_079/0017754
Grant - others:OP VVV - MSCA-IF IV FZU(XE) CZ.02.2.69/0.0/0.0/20_079/0017754
Institutional support: RVO:68378271
Keywords : cosmology of theories beyond the SM * CP violation * neutrino physics
OECD category: Particles and field physics
Impact factor: 6.376, year: 2021
Method of publishing: Open access

On the frequency-amplitude plane, Gravitational Waves (GWs) from cosmic strings show a flat plateau at higher frequencies due to the string loop dynamics in standard radiation dominated post-inflationary epoch. The spectrum may show an abrupt upward or a downward trend beyond a turning point frequency f∗_{*}∗​, if the primordial dark age prior to the Big Bang Nucleosynthesis (BBN), exhibits non-standard cosmic histories. We argue that such a spectral break followed by a rising GW amplitude which is a consequence of a post-inflationary equation of state (ω > 1/3) stiffer than the radiation (ω = 1/3), could also be a strong hint of a leptogenesis in the seesaw model of neutrino masses. Dynamical generation of the right handed (RH) neutrino masses by a gauged U(1) symmetry breaking leads to the formation of a network of cosmic strings which emits stochastic GWs.
Permanent Link: http://hdl.handle.net/11104/0329375