Neutrino oscillations in the early Universe
arXiv:hep-ph/0102114 · doi:10.1016/S0920-5632(01)01473-6
Abstract
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.
4 pages, 3 eps figures included, espcrc2.sty, talk at NOW2000 Workshop, 11-16 September 2000, Otranto, Italy, to be published in Nucl. Phys. B Suppl
Cited by in corpus (10)
- BBN bounds on active-sterile neutrino mixing
- Neutrino Oscillations in the Early Universe: A Real Time Formulation
- Relaxed constraints on neutrino oscillation parameters
- Neutrino Spectrum Distortion Due to Oscillations and its BBN Effect
- Oscillations and evolution of a hot and dense gas of flavor neutrinos: a quantum field theory study
- More General BBN Constraints on Neutrino Oscillations Parameters - Relaxed or Strengthened
- Overproduction of primordial helium-4 in the presence of neutrino oscillations
- Neutrino Oscillations and the Early Universe
- A Model for Neutrino Warm Dark Matter and Neutrino Oscillations
- On the Origin of the Circular and Hexagonal Formations in Galaxies