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arXiv · hep-ph/0012291

Creation of large spatial fluctuations in neutrino asymmetry by neutrino oscillations

Kari Enqvist·Kimmo Kainulainen·Antti Sorri
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Abstract

We consider active-sterile neutrino oscillations in the early universe in an inhomogeneous isocurvature background. We show that very small initial baryonic seed-inhomogeneities can trigger a growth of very large amplitude spatial fluctuations in lepton asymmetry. Domains of varying asymmetry are observed to persist for a long time despite dissipative effects. The space dependent asymmetry 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 almost the entire parameter space where exponential growth of asymmetry occurs would be ruled out by nucleosynthesis.

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Kari Enqvist, Kimmo Kainulainen, Antti Sorri. 2000-12-21. Creation of large spatial fluctuations in neutrino asymmetry by neutrino oscillations. https://doi.org/10.1088/1126-6708%2F2001%2F04%2F012

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