Four-Neutrino Mixing, Oscillations and Big-Bang Nucleosynthesis

Abstract

We investigate the implications of the standard Big-Bang Nucleosynthesis constraint on the number of light neutrinos in the framework of the two four-neutrino schemes that are favored by the results of neutrino oscillation experiments.

Comments: 15 pages. Talk presented by C. Giunti at the Symposium "New Era in Neutrino Physics", Tokyo Metropolitan University, Japan, 11-12 June, 1998