Trans-Planckian enhancements of the primordial non-Gaussianities

TL;DR

This paper investigates how breaking Lorentz invariance at tiny scales can significantly enhance primordial non-Gaussianities, providing stronger constraints on trans-Planckian physics during inflation.

Contribution

It introduces a set of irrelevant operators preserving spatial symmetries that can amplify non-Gaussian signals beyond standard inflationary predictions.

Findings

Non-Gaussianities can be substantially larger than usual.

Enhanced non-Gaussianities lead to tighter constraints on trans-Planckian physics.

Study of irrelevant operators affecting primordial perturbations.

Abstract

This article examines how breaking a Lorentz-invariant description of nature at tiny space-time intervals would affect the non-Gaussian character of the pattern of primordial perturbations left by inflation. We specifically study a set of irrelevant operators that preserve the spatial symmetries of the usual inflationary background. The non-Gaussian component in the primordial fluctuations can be much larger than the usual, small, inflationary prediction and can thus lead to much stronger constraints on the role of "trans-Planckian" physics in inflation than those from the measurements of the primordial power spectrum.