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Inverse Seesaw, dark matter and the Hubble tension

Pierre, M.; Fernandez-Martinez, E.; Pinsard, E. +1 more

We consider the inverse Seesaw scenario for neutrino masses with the approximate Lepton number symmetry broken dynamically by a scalar with Lepton number two. We show that the Majoron associated to the spontaneous symmetry breaking can alleviate the Hubble tension through its contribution to Δ N_eff and late decays to neutrinos. Among th…