2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/178916We outline how relic neutrino asymmetries may be generated in the early universe via active-sterile neutrino oscillations. We discuss possible consequences for big bang nucleosynthesis, within the context of a particular 4-neutrino model.6 pages. Talk given at NuFACT'01 workshop, Tsukuba, Japan (May 2001)High Energy Physics - Phenomenologytext