Creation of large spatial fluctuations in neutrino asymmetry by neutrino oscillations

Details Creation of large spatial fluctuations in neutrino asymmetry by neutrino oscillations Creation of large spatial fluctuations in neutrino asymmetry by neutrino oscillations

2000-12-21

arxiv.org/abs/hep-ph/0012291v1

JHEP 0104 (2001) 012

Physics

High Energy Physics

High Energy Physics - Phenomenology

1+21 pages, 3 figures

Scientific paper

10.1088/1126-6708/2001/04/012

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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