Relaxed constraints on neutrino oscillation parameters
Abstract
We study the cosmological constraints on active-sterile neutrino oscillations nue <-> nus for the case when nus is partially filled initially, i.e. 0 < delta Ns < 1. We provide numerical analysis of the cosmological production of He-4, in the presence of nue <-> nus oscillations, effective after neutrino decoupling, accounting for all known oscillations effects on cosmological nucleosynthesis. Cosmological constraints on oscillation parameters corresponding to higher than 5% He-4 overproduction and different non-zero initial populations of the sterile state delta Ns < 1 are calculated. These generalized cosmological constraints corresponding to delta Ns > 0 are relaxed in comparison with the delta Ns = 0 case and the relaxation is proportional to delta Ns.
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