Standard and non-standard primordial neutrinos
Abstract
The standard cosmological model predicts the existence of a cosmic neutrino background with a present density of about 110 cm-3 per flavour, which affects big-bang nucleosynthesis, cosmic microwave background anisotropies, and the evolution of large scale structures. We report on a precision calculation of the cosmic neutrino background properties including the modification introduced by neutrino oscillations. The role of a possible neutrino-antineutrino asymmetry and the impact of non-standard neutrino-electron interactions on the relic neutrinos are also briefly discussed.
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