2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/40585Neutrino asymmetry generation from active-sterile neutrino oscillations in the early Universe has different important cosmological effects. We discuss its basic features and present recent results on the borders of the generation for mixing angles $\sin^2 2θ_0\leq 10^{-7}$.4 pages, 2 figures, to be published in the proceedings of XXXVI th Rencontres de Moriond Electroweak Interactions and Unified TheoriesHigh Energy Physics - Phenomenologytext