25–29 May 2020
Jagiellonian University
Europe/Warsaw timezone

Gravitational footprints of massive neutrinos and lepton number breaking

27 May 2020, 11:45
50m
Jagiellonian University

Jagiellonian University

Speaker

Antonino Marciano

Description

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 seesaw schemes. We
examine both “high-scale” as well as “low-scale” variants, with either
explicit or spontaneously broken lepton number symmetry. In the latter
case, a pseudo-Goldstone boson, dubbed majoron, may provide a
candidate for warm or cold cosmological dark matter. We find that
schemes without majoron lead to either no FOPTs or too weak FOPTs,
precluding the detectability of GWs in present or near future
experiments. Nevertheless, we found that, in the presence of majorons,
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. We further
analyze the associated types of FOPTs and show that in certain cases,
the resulting GW spectra entail, as characteristic features, double or
multiple peaks, which can be resolved in forthcoming experiments. We
also found that the majoron variant of the low-scale seesaw mechanism
implies a different GW spectrum than the one expected in the
high-scale majoron 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 sector.

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