Polynomial chaotic inflation in supergravity

Abstract

We present a general polynomial chaotic inflation model in supergravity, for which the predicted spectral index and tensor-to-scalar ratio can liewithin the 1σ region allowed by the Planck results. Most importantly,the predicted tensor-to-scalar ratio is large enough to be probed in the on-going and future B-mode experiments. We study the inflaton dynamics and the subsequent reheating process in a couple of specific examples. The non-thermal gravitino productionfrom the inflaton decay can be suppressed in a case with a discrete Z2 symmetry.We find that the reheating temperature can be naturallyas high as O(109−10) GeV, sufficient for baryon asymmetry generation through (non-)thermal leptogenesis.