Leptogenesis via multiscalar coherent evolution with supersymmetric neutrino see-saw

A novel scenario of leptogenesis is investigated in the supersymmetric neutrino see-saw model. The right-handed sneutrino $\tilde{N}$ and the $\varphi$ field in the $\tilde{L}{H}_u$ direction of the slepton and Higgs doublets start together coherent evolution after the inflation with right-handed neutrino mass $M_N$ smaller than the Hubble parameter of inflation. Then, after some period the motion of $\tilde{N}$ and $\varphi$ is drastically changed by the cross coupling $M_N{h}_{\nu }{\tilde{N}}^{\ast }\varphi \varphi$ from the $M_{N}NN$ and $h_{\nu }NL{H}_u$ terms, and the significant asymmetries of $\tilde{N}$ and $\tilde{L}$ are generated. The $ {\tilde L} $ asymmetry is fixed later by the thermal effect as the lepton number asymmetry for baryogenesis, while the $\tilde{N}$ asymmetry disappears through the decays $ {\tilde N} \to {\bar L} {\bar{\tilde H}}_u, {\tilde L} H_u$ with almost the same rate but opposite final lepton numbers.