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The presence of additional neutrino states with masses in the GeV range isallowed by electro-weak precision observables. However, these additional statescan lead to lepton number violating interactions which potentially can wash outconsiderably any GUT scale generated or elsewise pre-existing baryon asymmetry.We discuss the resulting bounds on neutrino parameters and find that - unlessthe baryon asymmetry is created at or below the electroweak scale or in someflavor which is decoupled from interactions to the new neutrino states - thesehave to be pseudo-Dirac with mass splittings between the right-handed andleft-handed states of less than about ten keV.

Baryon asymmetry of the universe and new neutrino states