Large non-Gaussianity generated after D-term Inflation by Right-Handed Sneutrino Curvaton

TL;DR

This paper explores how a right-handed sneutrino curvaton can generate significant non-Gaussianity after D-term inflation, while also addressing the cosmic string problem and neutrino mass implications.

Contribution

It demonstrates a mechanism for large non-Gaussianity generation post-inflation using a right-handed sneutrino curvaton, linking inflation, neutrino physics, and cosmic string constraints.

Findings

Non-Gaussianity can reach 10<f_{NL}<100 with specific sneutrino parameters.

Cosmic string problem can be avoided with ~10% contribution to CMB spectrum.

Lightest neutrino mass is predicted to be around 10^{-10} eV.

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 $n_s \simeq 1$. The non-Gaussianity produced can be as large as $10<f_{NL}<100$ for the right-handed sneutrino mass being around $m_\Phi=10 {GeV}$ with the Yukawa coupling $\lambda_\nu \sim 10^{-10}$. In this case, the lightest neutrino mass is $10^{-10}{eV}$ which favors RH sneutrino leptogenesis.