Majorana mass generation, gravitational waves and cosmological tensions
Majorana mass generation, gravitational waves and cosmological tensions
A neutrino Majorana mass generation in the early universe might have left imprints in cosmological observables. It can source the production of a detectable stochastic background of primordial gravitational waves with a spectrum that combines a contribution from a first order phase transition production and from the vibration of global cosmic strings. An intriguing possibility is given by the split seesaw model. In this case, in addition to the traditional high scale seesaw, a low scale neutrino Majorana mass generation can solve a potential primordial deuterium problem and ameliorate the cosmological tensions of the ΛCDM model. At the same time, it can also produce subdominant contribution to the NANOGrav signal of a stochastic background of gravitational waves (GWs), in addition to the astrophysical dominant contribution from supermassive black hole mergers.
hep-ph
Bari, Pasquale Di
3fe21e59-0eff-41bc-8faa-fdd817146418
Bari, Pasquale Di
3fe21e59-0eff-41bc-8faa-fdd817146418
[Unknown type: UNSPECIFIED]
Abstract
A neutrino Majorana mass generation in the early universe might have left imprints in cosmological observables. It can source the production of a detectable stochastic background of primordial gravitational waves with a spectrum that combines a contribution from a first order phase transition production and from the vibration of global cosmic strings. An intriguing possibility is given by the split seesaw model. In this case, in addition to the traditional high scale seesaw, a low scale neutrino Majorana mass generation can solve a potential primordial deuterium problem and ameliorate the cosmological tensions of the ΛCDM model. At the same time, it can also produce subdominant contribution to the NANOGrav signal of a stochastic background of gravitational waves (GWs), in addition to the astrophysical dominant contribution from supermassive black hole mergers.
Text
2406.00525v1
- Author's Original
More information
Accepted/In Press date: 1 June 2024
Additional Information:
8 pages, 1 figure; talk given at EW Moriond 2024 (La Thuile, 24-31 March 2024)
Keywords:
hep-ph
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Local EPrints ID: 496310
URI: http://eprints.soton.ac.uk/id/eprint/496310
PURE UUID: 76948254-4fb3-425c-b671-cc043cbfdd45
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Date deposited: 11 Dec 2024 17:46
Last modified: 11 Dec 2024 17:46
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