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We propose a new mechanism to block the active-sterile neutrino oscillationsin the Early Universe. We show that a typical consequence of theories where thelepton number is spontaneously broken is the existence of a coherentcosmological Majoron field with a strength proportional to the lepton andbaryon numbers of the Universe. This field interacts with leptons and changesthe potentials relevant for neutrino oscillations. If the scale of leptonnumber symmetry breaking is of the order of 1 GeV then a Majoron field andlepton number asymmetry of the order of the baryon asymmetry are strong enoughto block the active-sterile neutrino oscillations with the atmospheric neutrinomass gap which otherwise would bring the sterile neutrino into equilibrium atthe big bang nucleosynthesis epoch.Comment: 15 pages, revtex; v3 to match PRD pape

Blocking active-sterile neutrino oscillations in the early universe with a Majoron field