Amplification of Isocurvature Perturbations induced by Active-Sterile Neutrino Oscillations

Details Amplification of Isocurvature Perturbations induced by Active-Sterile Neutrino Oscillations Amplification of Isocurvature Perturbations induced by Active-Sterile Neutrino Oscillations

1999-11-03

arxiv.org/abs/hep-ph/9911214v1

Phys.Lett. B482 (2000) 150-160

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages + 3 included ps figures

Scientific paper

10.1016/S0370-2693(00)00487-1

We show how the generation of a lepton number in the Early Universe induced by active-sterile neutrino oscillations, in presence of small baryon number inhomogeneities, gives rise to the formation of lepton domains, regions with different values of active neutrino chemical potential. The structure of these domains reflects the spectral features of the baryon number inhomogeneities that generated it. An interesting aspect of the mechanism is that the size of lepton domains can be super-horizon.

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