Please use this identifier to cite or link to this item:
http://hdl.handle.net/10773/29874
Title: | Gravitational footprints of massive neutrinos and lepton number breaking |
Author: | Addazi, Andrea Marcianò, Antonino Morais, António P. Pasechnik, Roman Srivastava, Rahul Valle, José W. F. |
Issue Date: | 10-Aug-2020 |
Publisher: | Elsevier |
Abstract: | 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 detectability 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. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/29874 |
DOI: | 10.1016/j.physletb.2020.135577 |
ISSN: | 0370-2693 |
Appears in Collections: | CIDMA - Artigos DFis - Artigos GGDG - Artigos |
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Antonio1.pdf | 793.56 kB | Adobe PDF | View/Open |
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