Non-Gaussianity in DHOST inflation

TL;DR

This paper explores how DHOST inflation models with axion-like potentials can produce large non-Gaussianities, which may be detectable by future experiments and require detailed analysis of current data.

Contribution

It analyzes the non-Gaussian signatures of DHOST inflation models and demonstrates their potential to produce large non-Gaussianities distinct from standard templates.

Findings

DHOST models can generate large non-Gaussianities with small overlap with standard templates.

The reduced bispectrum in these models indicates potential for future observational detection.

Current Planck data may already contain signatures of such non-Gaussianities.

Abstract

DHOST inflation models where deviations from a pure de Sitter background are induced by an axion-like potential can lead to large non-Gaussianities. We investigate the nature of non-Gaussianities in these models and compare to the results given by the Planck experiment. The overlap between the DHOST non-Gaussianities and the equilateral, orthogonal and local templates can be rendered arbitrarily small. On the other hand, this does not preclude DHOST models from showing large non-Gaussianities as exemplified by their reduced bispectrum. As a result, they could be probed by future experiments and also by a more thorough analysis of the existing Planck data.