Sneutrino hybrid inflation in supergravity

We propose a hybrid inflation scenario in which the singlet sneutrino, the superpartner of the right-handed neutrino, plays the role of the inflaton. We study a minimal model of sneutrino hybrid inflation in supergravity, where we find a spectral index $n_{\mathrm{s}}\approx 1+2\gamma$ with $|\gamma |\lesssim 0.02$, and predict a running spectral index $|\mathrm{d}{n}_{\mathrm{s}}/\mathrm{d}\ln k|\ll |\gamma |$ and a tensor-to-scalar ratio $r\ll {\gamma }^2$ for field values well below the Planck scale. In our scenario, the baryon asymmetry of our universe can be explained via nonthermal leptogenesis and a low reheat temperature $T_{\mathrm{RH}}\approx {10}^6$ GeV can be realized.