Gravitational wave complementarity and impact of NANOGrav data on gravitational leptogenesis
Abstract
In seesaw mechanism, if right handed (RH) neutrino masses are generated dynamically by a gauged U(1) symmetry breaking, a stochastic gravitational wave background (SGWB) sourced by a cosmic string network could be a potential probe of leptogenesis. We show that the leptogenesis mechanism that facilitates the dominant production of lepton asymmetry via the quantum effects of right-handed neutrinos in gravitational background, can be probed by GW detectors as well as next-generation neutrinoless double beta decay (0νββ) experiments in a complementary way. We infer that for a successful leptogenesis, an exclusion limit on f − ΩGWh2 plane would correspond to an exclusion on the |mββ| − m1 plane as well. We consider a normal light neutrino mass ordering and discuss how recent NANOGrav pulsar timing data (if interpreted as GW signal) e.g., at 95% CL, would correlate with the potential discovery or null signal in 0νββ decay experiments.
- Publication:
-
Journal of High Energy Physics
- Pub Date:
- May 2021
- DOI:
- 10.1007/JHEP05(2021)211
- arXiv:
- arXiv:2009.13452
- Bibcode:
- 2021JHEP...05..211S
- Keywords:
-
- Cosmology of Theories beyond the SM;
- CP violation;
- Neutrino Physics;
- High Energy Physics - Phenomenology;
- Astrophysics - Cosmology and Nongalactic Astrophysics;
- Astrophysics - Astrophysics of Galaxies;
- General Relativity and Quantum Cosmology
- E-Print:
- 16 pages, 4 figures, discussion on flavour couplings added. Explanation on the trace anomaly added. matches with the JHEP version