Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2012/02/021
Keywords
baryon asymmetry; neutrino theory; cosmological neutrinos; physics of the early universe
Funding
- KAKENHI in JSPS [21540260]
- JSPS
- Grants-in-Aid for Scientific Research [21540260, 21340055] Funding Source: KAKEN
Ask authors/readers for more resources
We investigate baryogenesis in the nu MSM (neutrino Minimal Standard Model), which is the SM extended by three right-handed neutrinos with masses below the electroweak scale. The baryon asymmetry of the universe can be generated by the mechanism via flavor oscillation of right-handed (sterile) neutrinos which are responsible to masses of active neutrinos confirmed by various experiments. We present the kinetic equations for the matrix of densities of leptons which describe the generation of asymmetries. Especially, the momentum dependence of the matrix of densities is taken into account. By solving these equations numerically, it is found that the momentum distribution is significantly distorted from the equilibrium one, since the production for the modes with lower momenta k << T (T is the temperature of the universe) is enhanced, while suppressed for higher modes. As a result, the most important mode for the yields of sterile neutrinos as well as the baryon asymmetry is k similar or equal to 2 T, which is smaller than < k > inferred from the thermal average. The comparison with the previous works is also discussed.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available