Inhomogeneous non-Gaussianity

TL;DR

This paper introduces a method to analyze the inhomogeneity of local non-Gaussian parameters across the sky to probe higher-order correlators of the primordial density field, aiding in understanding inflationary physics.

Contribution

It proposes a novel approach to measure inhomogeneities in non-Gaussian parameters to detect higher-order correlators and distinguish inflationary models.

Findings

Inhomogeneity of non-Gaussian parameters can reveal higher-order correlators.

Method can differentiate between single and multiple-source inflation scenarios.

Potential to constrain inflationary physics through sky patch analysis.

Abstract

We propose a method to probe higher-order correlators of the primordial density field through the inhomogeneity of local non-Gaussian parameters, such as f_NL, measured within smaller patches of the sky. Correlators between n-point functions measured in one patch of the sky and k-point functions measured in another patch depend upon the (n+k)-point functions over the entire sky. The inhomogeneity of non-Gaussian parameters may be a feasible way to detect or constrain higher-order correlators in local models of non-Gaussianity, as well as to distinguish between single and multiple-source scenarios for generating the primordial density perturbation, and more generally to probe the details of inflationary physics.