Probing leptogenesis and pre-BBN universe with gravitational waves spectral shapes
Abstract 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 poin...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2021-11-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP11(2021)017 |
| _version_ | 1819043738804027392 |
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| author | Rome Samanta Satyabrata Datta |
| author_facet | Rome Samanta Satyabrata Datta |
| author_sort | Rome Samanta |
| collection | DOAJ |
| description | Abstract 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. A gravitational interaction of the lepton current by an operator of the form ∂ μ Rj μ — which can be generated in the seesaw model at the two-loop level through RH neutrino mediation, naturally seeks a stiffer equation of state to efficiently produce baryon asymmetry proportional to 1 − 3ω. We discuss how GWs with reasonably strong amplitudes complemented by a neutrino-less double beta decay signal could probe the onset of the most recent radiation domination and lightest RH neutrino mass at the intermediate scales. |
| first_indexed | 2024-12-21T10:01:34Z |
| format | Article |
| id | doaj.art-cedd0d2d8bf64e94a149d3d3432b384f |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-12-21T10:01:34Z |
| publishDate | 2021-11-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-cedd0d2d8bf64e94a149d3d3432b384f2022-12-21T19:07:56ZengSpringerOpenJournal of High Energy Physics1029-84792021-11-0120211112410.1007/JHEP11(2021)017Probing leptogenesis and pre-BBN universe with gravitational waves spectral shapesRome Samanta0Satyabrata Datta1CEICO, Institute of Physics of the Czech Academy of SciencesSaha Institute of Nuclear Physics, HBNIAbstract 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. A gravitational interaction of the lepton current by an operator of the form ∂ μ Rj μ — which can be generated in the seesaw model at the two-loop level through RH neutrino mediation, naturally seeks a stiffer equation of state to efficiently produce baryon asymmetry proportional to 1 − 3ω. We discuss how GWs with reasonably strong amplitudes complemented by a neutrino-less double beta decay signal could probe the onset of the most recent radiation domination and lightest RH neutrino mass at the intermediate scales.https://doi.org/10.1007/JHEP11(2021)017Cosmology of Theories beyond the SMCP violationNeutrino Physics |
| spellingShingle | Rome Samanta Satyabrata Datta Probing leptogenesis and pre-BBN universe with gravitational waves spectral shapes Journal of High Energy Physics Cosmology of Theories beyond the SM CP violation Neutrino Physics |
| title | Probing leptogenesis and pre-BBN universe with gravitational waves spectral shapes |
| title_full | Probing leptogenesis and pre-BBN universe with gravitational waves spectral shapes |
| title_fullStr | Probing leptogenesis and pre-BBN universe with gravitational waves spectral shapes |
| title_full_unstemmed | Probing leptogenesis and pre-BBN universe with gravitational waves spectral shapes |
| title_short | Probing leptogenesis and pre-BBN universe with gravitational waves spectral shapes |
| title_sort | probing leptogenesis and pre bbn universe with gravitational waves spectral shapes |
| topic | Cosmology of Theories beyond the SM CP violation Neutrino Physics |
| url | https://doi.org/10.1007/JHEP11(2021)017 |
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