Conditions for observable bi and tri-spectra in two-field slow-roll inflation

Abstract

We find constraints on inflationary dynamics that yield a large local bispectrum and/or trispectrum during two-field slow-roll inflation. This leads to simple relations between the non-Gaussianity parameters, simplifying the Suyama-Yamaguchi inequality and also producing a new result between the trispectrum parameters tNL and gNL.

3 pages; Proceedings of 13th Marcel Grossmann Meeting, Stockholm, July 2012