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Sterile massive neutrinos are a natural extension of the Standard Model ofelementary particles. The energy density of the extra sterile massive statesaffects cosmological measurements in an analogous way to that of activeneutrino species. We perform here an analysis of current cosmological data andderive bounds on the masses of the active and the sterile neutrino states aswell as on the number of sterile states. The so-called (3+2) models with threesub-eV active massive neutrinos plus two sub-eV massive sterile species is wellwithin the 95% CL allowed regions when considering cosmological data only. Ifthe two extra sterile states have thermal abundances at decoupling, Big BangNucleosynthesis bounds compromise the viability of (3+2) models. Forecasts fromfuture cosmological data on the active and sterile neutrino parameters are alsopresented. Independent measurements of the neutrino mass from tritium betadecay experiments and of the Hubble constant could shed light on sub-eV massivesterile neutrino scenarios.

Constraints on massive sterile neutrino species from current and future cosmological data