Large non-Gaussianity generated after D-term inflationby right-handed sneutrino curvaton

Abstract

In this paper, we consider large non-Gaussianity generated after D-term inflation in the case that the adiabatic curvature perturbation produced is dominated by a right-handed (RH) sneutrino curvaton. The cosmic string problem can also be evaded with around 10% contribution to the CMB power spectrum and the spectral index ns ≃ 1. The non-Gaussianity produced can be as large as 10 < fNL < 100 for the right-handed sneutrino mass being around mΦ = 100 GeV with the Yukawa coupling λν ∼ 10−10. In this case, the lightest neutrino mass is 10−10 eV which favors RH sneutrino leptogenesis.