Implications of Planck results for models with local type non-Gaussianity

TL;DR

This paper analyzes how recent Planck satellite data constrains models with local type non-Gaussianity, focusing on trispectrum predictions and the potential for gNL to be a primary signature.

Contribution

It provides updated parameter constraints for local non-Gaussian models and explores the significance of trispectrum, especially gNL, as a key observational signature.

Findings

Planck data constrains local non-Gaussianity parameters

Trispectrum gNL can be large even if fNL is small

Trispectrum may be the first detectable non-Gaussian signature

Abstract

We discuss implications of Planck results for models with local type non-Gaussianity. In light of the recent results of the Planck satellite, we constrain model parameters of several representative models and give the prediction of trispectrum, in particular, gNL. We also consider interesting possibilities that trispectrum appears as the first signature of the non-Gaussianities of the curvature perturbations, that is, fNL is small while gNL can be significantly large.