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Hernández, P.; Kekic, M.; Lopez-Pavon, J.
Physical review. D, Particles, fields, gravitation, and cosmology, 09/2014, Letnik: 90, Številka: 6Journal Article
We evaluate the contribution to N sub(eff) of the extra sterile states in low-scale type I seesaw models (with three extra sterile states). We explore the full parameter space and find that at least two of the heavy states always reach thermalization in the early Universe, while the third one might not thermalize provided the lightest neutrino mass is below scriptO(10 super(-3) eV). Constraints from cosmology therefore severely restrict the spectra of heavy states in the range 1 eV-100 MeV. The implications for neutrinoless double beta decay are also discussed.
