Gravitational wave complementarity and impact of NANOGrav data on gravitational leptogenesis

0554717 - FZÚ 2022 RIV US eng J - Journal Article
Samanta, Rome - Datta, S.
Gravitational wave complementarity and impact of NANOGrav data on gravitational leptogenesis.
Journal of High Energy Physics. Roč. 2021, č. 5 (2021), č. článku 211. 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

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 − ΩGW_{GW}GW​h2^{2}2 plane would correspond to an exclusion on the |mββ_{ββ}ββ​| − m1_{1}1​ 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.
Permanent Link: http://hdl.handle.net/11104/0329378