Multiple peaks in gravitational waves induced from primordial curvature perturbations with non-Gaussianity

TL;DR

This paper explores how non-Gaussian primordial curvature perturbations can generate multiple peaks in gravitational wave spectra, providing new insights into early universe conditions near the end of inflation.

Contribution

It extends previous Gaussian-based analyses to include non-Gaussian effects, offering rules for predicting gravitational wave peak structures from multiple curvature perturbation peaks.

Findings

Identifies multiple peaks in gravitational waves from non-Gaussian perturbations

Provides guidelines for predicting peak locations and amplitudes

Enhances understanding of inflationary small-scale perturbations

Abstract

First-order primordial curvature perturbations are known to induce gravitational waves at the second-order, which can in turn probe the small-scale curvature perturbations near the end of the inflation. In this work, we extend the previous analysis in the Gaussian case into the non-Gaussian case, with particular efforts to obtain some thumb rules of sandwiching the associated peaks in gravitational waves induced from multiple peaks of non-Gaussian curvature perturbations.