Inverse Seesaw, dark matter and the Hubble tension

Abstract

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 $\Delta N_{\text{eff}}$ and late decays to neutrinos. Among the additional fermionic states required for realizing the inverse Seesaw mechanism, sterile neutrinos at the keV-MeV scale can account for all the dark matter component of the Universe if produced via freeze-in from the decays of heavier degrees of freedom.

arXiv comment22 pages, 2 figures

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Cited by in corpus (3)

• Gauged Inverse Seesaw from Dark Matter
• Cosmology of an Axion-Like Majoron
• Robustness of ARS Leptogenesis in Scalar Extensions