TY  - JOUR
AU  - Addazi, A.
AU  - Marciano, A.
AU  - Morais, A. P.
AU  - Pasechnik, R.
AU  - Srivastava, R.
AU  - Valle, J. W. F.
PY  - 2020
DA  - 2020//
TI  - Gravitational footprints of massive neutrinos and lepton number breaking
T2  - Phys. Lett. B
JO  - Physics Letters B
SP  - 135577
EP  - 8pp
VL  - 807
PB  - Elsevier
AB  - We investigate the production of primordial Gravitational Waves (GWs) arising from First Order Phase Transitions (FOPTs) associated to neutrino mass generation in the context of type-I and inverse seesaw schemes. We examine both "high-scale" as well as "low-scale" variants, with either explicit or spontaneously broken lepton number symmetry U(1)(L), in the neutrino sector. In the latter case, a pseudo-Goldstone majoron-like boson may provide a candidate for cosmological dark matter. We find that schemes with softly-broken U(1)(L), and with single Higgs-doublet scalar sector lead to either no FOPTs or too weak FOPTs, precluding the detestability of GWs in present or near future measurements. Nevertheless, we found that, in the majoron-like seesaw scheme with spontaneously broken U(1)(L), at finite temperatures, one can have strong FOPTs and non-trivial primordial GW spectra which can fall well within the frequency and amplitude sensitivity of upcoming experiments, including LISA, BBO and u-DECIGO. However, GWs observability clashes with invisible Higgs decay constraints from the LHC. A simple and consistent fix is to assume the majoron-like mass to lie above the Higgs-decay kinematical threshold. We also found that the majoron-like variant of the low-scale seesaw mechanism implies a different GW spectrum than the one expected in the high-scale seesaw. This feature will be testable in future experiments. Our analysis shows that GWs can provide a new and complementary portal to test the neutrino mass generation mechanism.
SN  - 0370-2693
UR  - https://arxiv.org/abs/1909.09740
UR  - https://doi.org/10.1016/j.physletb.2020.135577
DO  - 10.1016/j.physletb.2020.135577
LA  - English
N1  - WOS:000571765700055
ID  - Addazi_etal2020
ER  -