Maximum lepton asymmetry from active-sterile neutrino oscillations in the Early Universe

Physics – High Energy Physics – High Energy Physics - Phenomenology

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

14 pp, 4 figures

Scientific paper

10.1103/PhysRevD.64.017302

A large lepton asymmetry could be generated in the Early Universe by oscillations of active to sterile neutrinos with a small mixing angle sin 2 \theta < 10^-2. The final order of magnitude of the lepton asymmetry \eta is mainly determined by its growth in the last stage of evolution when the MSW resonance dominates the kinetic equations. In this paper we present a simple way of calculating the maximum possible lepton asymmetry which can be created. Our results are in good agreement to previous calculations. Furthermore, we find that the growth of asymmetry does not obey any particular power law. We find that the maximum possible asymmetry at the freeze-out of the n/p ratio at T \sim 1 MeV strongly depends on the mass-squared difference \delta m^2: the asymmetry is negligible for \delta m^2 \ll 1 eV^2 and reaches asymptotically large values for \delta m^2 \ge 50 eV^2.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Maximum lepton asymmetry from active-sterile neutrino oscillations in the Early Universe does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Maximum lepton asymmetry from active-sterile neutrino oscillations in the Early Universe, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Maximum lepton asymmetry from active-sterile neutrino oscillations in the Early Universe will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-532450

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.