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Non-Gaussianity in DHOST inflation

Authors
  • Brax, Philippe
  • Lazanu, Andrei
Type
Published Article
Journal
Journal of Cosmology and Astroparticle Physics
Publisher
IOP Publishing
Publication Date
Jan 01, 2022
Volume
2022
Issue
01
Identifiers
DOI: 10.1088/1475-7516/2022/01/026
Source
ioppublishing
Keywords
Disciplines
  • paper
License
Unknown

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.

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