Non-Gaussian Features of Primordial Gravitational Waves

TL;DR

This paper investigates non-Gaussian features in primordial gravitational waves using a model-independent approach, highlighting the higher detectability of squeezed limit bispectra in future CMB observations.

Contribution

It introduces generic templates for tensor bispectrum nonlinearity parameters within the Effective Field Theory of inflation, independent of specific models.

Findings

Higher likelihood of detecting squeezed limit tensor bispectrum

Detection prospects are promising for upcoming CMB missions

Results are broadly applicable due to model-independent analysis

Abstract

We explore possible non-Gaussian features of primordial gravitational waves by constructing model-independent templates for nonlinearity parameters of tensor bispectrum. Our analysis is based on Effective Field Theory of inflation that relies on no particular model as such and thus the results are quite generic. The analysis further reveals that chances of detecting squeezed limit tensor bispectrum are fairly higher than equilateral limit. We also discuss prospects of detectability in upcoming CMB missions.