Chaotic inflation and baryogenesis by right-handed sneutrinos.

Abstract

We present a model of chaotic inflation driven by the superpartner of the right-handed neutrino (N${\mathrm{\ifmmode \tilde{}\else \~{}\fi{}}}_{\mathit{R}}$). This model gives the correct magnitude of the density perturbation observed by the Cosmic Background Explorer satellite with a right-handed neutrino mass \ensuremath{\simeq}${10}^{13}$ GeV, which is also preferred by the Mikheyev-Smirnov-Wolfenstein solution to the solar neutrino problem. The reheating process is the dacay of the coherently oscillating N${\mathrm{\ifmmode \tilde{}\else \~{}\fi{}}}_{\mathit{R}}$. This decay process also generates lepton asymmetry via CP violation, which will be converted to baryon asymmetry thanks to the electroweak anomaly. This model can incorporate the \ensuremath{\tau}-neutrino mass \ensuremath{\simeq}10 eV.