Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-05-11
Phys.Rev. D70 (2004) 063511
Physics
High Energy Physics
High Energy Physics - Phenomenology
Typos corrected. Version to appear in Phys. Rev. D
Scientific paper
10.1103/PhysRevD.70.063511
We study the thermal leptogenesis in the scenario where the standard model is extended to include one $SU(2)_{L}$ triplet Higgs boson, in addition to three generations of the right-handed neutrinos. And in the model we introduce the coupling between the Quintessence and the right-handed neutrinos, the triplet Higgs boson, so that the light neutrino masses vary during the evolution of the universe. Assuming that the lepton number asymmetry is generated by the decays of the lightest right-handed neutrino $N_{1}$, we find the thermal leptogenesis can be characterized by four model independent parameters. In the case where the contribution of the triplet Higgs to the lepton asymmetry is dominant, we give the relation between the minimal $M_{1}$ and the absolute mass scale $\bar{m}$ of the light neutrinos, by solving the Boltzmann equations numerically. We will also show that with the varying neutrino masses, the reheating temperature can be lowered in comparison with the traditional thermal leptogenesis.
Bi Xiao-Jun
Gu Peihong
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