We investigate the production of primordial Gravitation Waves (GWs) arising from First Order Phase Transitions (FOPT) associated to neutrino mass generation in the context of type-I seesaw models. We examine both high scale and 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 candida
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