2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/39378We investigate analytically the evolution of the primordial neutrino asymmetry caused by active-sterile neutrino oscillations. In particular, we concentrate on possible chaotic oscillations of the asymmetry. For a certain range of parameters, we find that the asymmetry indeed oscillates, provided we neglect the momentum distribution.Masters Thesis (TU Munich), 52 ppHigh Energy Physics - PhenomenologyAstrophysicstext