Neutrino oscillations in the early Universe

Details Neutrino oscillations in the early Universe Neutrino oscillations in the early Universe

2001-02-09

arxiv.org/abs/hep-ph/0102114v1

Nucl.Phys.Proc.Suppl. 100 (2001) 360-362

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 3 eps figures included, espcrc2.sty, talk at NOW2000 Workshop, 11-16 September 2000, Otranto, Italy, to be published

Scientific paper

10.1016/S0920-5632(01)01473-6

We discuss the oscillations effects on neutrinos in the early Universe and update the cosmological constraints on the oscillation parameters. It is shown that sterile LOW solution to the solar neutrino problem is almost completely excluded from cosmological nucleosynthesis considerations. Two possibilities for the relaxation of this constraint are discussed: high primordial helium-4 yield and a relic lepton asymmetry present at nucleosynthesis epoch. The numerical analysis proved that Y_p=0.25 only relaxes the constraint on LOW solution, while L > 10^{-5} is capable to remove it.

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