Oscillation Induced Neutrino Asymmetry Growth in the Early Universe

Details Oscillation Induced Neutrino Asymmetry Growth in the Early Universe Oscillation Induced Neutrino Asymmetry Growth in the Early Universe

2001-12-11

arxiv.org/abs/hep-ph/0112158v1

JHEP 0202 (2002) 020

Physics

High Energy Physics

High Energy Physics - Phenomenology

23 pages, 9 eps-figs, Latex, uses JHEP class

Scientific paper

10.1088/1126-6708/2002/02/020

We study the dynamics of active-sterile neutrino oscillations in the early universe using full momentum-dependent quantum-kinetic equations. These equations are too complicated to allow for an analytical treatment, and numerical solution is greatly complicated due to very pronounced and narrow structures in the momentum variable introduced by resonances. Here we introduce a novel dynamical discretization of the momentum variable which overcomes this problem. As a result we can follow the evolution of neutrino ensemble accurately well into the stable growing phase. Our results confirm the existence of a "chaotic region" of mixing parameters, for which the final sign of the asymmetry, and hence the SBBN prediction of He(4)-abundance cannot be accurately determined.

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