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

TL;DR

This paper derives conditions under which two-field slow-roll inflation models can produce observable non-Gaussian features like bispectra and trispectra, providing new relations among these parameters to aid observational tests.

Contribution

It establishes specific constraints on inflationary dynamics that generate large non-Gaussianities and introduces new relations among trispectrum parameters, refining theoretical predictions.

Findings

Derived simplified relations between non-Gaussianity parameters

Produced a new relation between tNL and gNL

Refined the Suyama-Yamaguchi inequality for two-field 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.