Abstract
The production of 4He during cosmological nucleosynthesis in the presence of active-sterile oscillations, v e ↔ v 5, which is efficient after decoupling of the electron neutrino, is analysed. The oscillation effects on primordial nucleosynthesis, namely neutrino spectrum distortion, depletion of the electron neutrino number density and generation of neutrino-antineutrino asymmetry, are precisely taken into account. The maximal primordial 4He is calculated, in a self-consistent study of the kinetics of the nucleons and the oscillating neutrinos, for the full range of parameters of the discussed oscillation model. The maximal relative increase of 4He, up to 14% for non-resonant oscillations and up to 32% for resonant oscillations is found. Cosmological constraints on oscillation parameters are discussed.
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