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    • Cosmology of an axion-like majoron 

      Cuesta, A.J.; Gómez, M.E.; Illana, J.I.; Masip, M. (IOP Publishing, 2022)
      We propose a singlet majoron model that defines an inverse seesaw mechanism in the ν sector. The majoron ϕ has a mass mϕ ≈ 0.5 eV and a coupling to the τ lepton similar to the one to neutrinos. In the early universe it is ...

    • Photon to axion conversion during Big Bang Nucleosynthesis 

      Cuesta, A.J.; Illana, J.I.; Masip, M. (IOP Publishing, 2023)
      We investigate how the resonant conversion at a temperature T¯=25-65 keV of a fraction of the CMB photons into an axion-like majoron affects BBN. The scenario, that assumes the presence of a primordial magnetic field and ...