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We consider active-sterile neutrino oscillations in the early universe in aninhomogeneous isocurvature background. We show that very small initial baryonicseed-inhomogeneities can trigger a growth of very large amplitude spatialfluctuations in lepton asymmetry. Domains of varying asymmetry are observed topersist for a long time despite dissipative effects. The space dependentasymmetry profiles give rise to MSW-resonances within the domain boundaries,enhancing dramatically the equilibration of the sterile neutrino species.According to our one-dimensional toy-model, the effect is so strong that almostthe entire parameter space where exponential growth of asymmetry occurs wouldbe ruled out by nucleosynthesis.Comment: 1+21 pages, 3 figure

Creation of large spatial fluctuations in neutrino asymmetry by neutrino oscillations