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A convincing explanation of the smallness of neutrino masses is representedby the Type-I Seesaw mechanism, where the two measured neutrino massdifferences can be generated by introducing at least two right-handedneutrinos. In an ultraviolet complete model, it is possible to dynamicallygenerate the heavy Majorana scale through the spontaneous symmetry breaking ofa global Abelian symmetry and the most economical realisation consists incoupling the two exotic neutral leptons to a singlet complex scalar field. Theassociated Goldstone boson is often dubbed as Majoron, which may achieve anon-vanishing mass by means of a small term that explicitly breaks the Abeliansymmetry. In a generic model, the neutrino and Majoron mass generationmechanisms are completely uncorrelated. In this paper, instead, we reduce thelandscape of possible models proposing a unique, minimal and predictiveframework in which these two types of masses are strictly tied and arise fromthe same source. Bounds from various terrestrial and astrophysical experimentsare discussed.

The Minimal Massive Majoron Seesaw Model