  We consider instant preheating as the mechanism for generating the curvature
perturbation at the end of chaotic inflation. Then we examine if inflation
could be driven by a Minimal Supersymmetric Standard Model (MSSM) flat
direction or a sneutrino. Our simple mechanism relaxes some serious constraints
that appeared in past studies, making inflation driven by a MSSM flat direction
or a sneutrino more plausible.

High Energy Physics - Phenomenology;Astrophysics;High Energy Physics - Theory