# Non-Gaussianity in DHOST inflation

@article{Brax2022NonGaussianityID, title={Non-Gaussianity in DHOST inflation}, author={Philippe Brax and Andrei Lazanu}, journal={Journal of Cosmology and Astroparticle Physics}, year={2022}, volume={2022} }

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…

## References

SHOWING 1-10 OF 58 REFERENCES

Scale-dependence in DHOST inflation

- Physics
- 2021

We study the inflationary consequences of Degenerate Higher Order Scalar Tensor (DHOST) theories in a de Sitter background. We perturb the de Sitter background by operators breaking either the…

Large non-Gaussianities in single-field inflation

- Physics
- 2007

We compute the three-point correlation function for a general model of inflation driven by a single, minimally coupled scalar field. Our approach is based on the numerical evaluation of both the…

The shape of non-Gaussianities

- Physics
- 2004

We study the dependence on the configuration in momentum space of the primordial three-point function of density perturbations in several different scenarios: standard slow-roll inflation, curvaton…

Generation and Characterization of Large Non-Gaussianities in Single Field Inflation

- Physics
- 2008

Inflation driven by a single, minimally coupled, slowly rolling field generically yields a negligible primordial non-Gaussianity. We discuss two distinct mechanisms by which a non-trivial potential…

Primordial Non-Gaussianities from Inflation Models

- Physics
- 2010

This is a pedagogical review on primordial non-Gaussianities from inflation models. We introduce formalisms and techniques that are used to compute such quantities. We review different mechanisms…

Cosmological evolution in DHOST theories

- PhysicsJournal of Cosmology and Astroparticle Physics
- 2019

In the context of Degenerate Higher-Order Scalar-Tensor (DHOST) theories, we study cosmological solutions and their stability properties. In particular, we explicitly illustrate the crucial role of…

Matter bispectrum in cubic Galileon cosmologies

- Physics
- 2013

In this paper we obtain the bispectrum of dark matter density perturbations in the frame of covariant cubic Galileon theories. This result is obtained by means of a semi-analytic approach to…

Planck 2018 results. IX. Constraints on primordial non-Gaussianity

- Physics
- 2019

We analyse the Planck full-mission cosmic microwave background (CMB) temperature and E-mode polarization maps to obtain constraints on primordial non-Gaussianity (NG). We compare estimates obtained…

Shape of primordial non-Gaussianity and the CMB bispectrum

- Physics
- 2009

We present a set of formalisms for comparing, evolving, and constraining primordial non-Gaussian models through the CMB bispectrum. We describe improved methods for efficient computation of the full…

Constraints on galaxy bias, matter density, and primordial non-Gaussianity from the PSCz galaxy redshift survey.

- Physics, MedicinePhysical review letters
- 2001

The bispectrum for the IRAS PSCz catalog is computed and it is found that the galaxy distribution displays the characteristic signature of gravity, imposing stringent constraints on non-Gaussian initial conditions.