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  • Open Access

Primordial non-Gaussianities for nonsingular Horndeski cosmologies

Y. Ageeva* and M. Kotenko†

P. Petrov‡

  • *Contact author: ageeva@inr.ac.ru
  • †Contact author: max.kotenko@yandex.ru
  • ‡Contact author: petrov@inr.ac.ru, p669590371@ibs.re.kr
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Phys. Rev. D 112, 063526 – Published 15 September, 2025

DOI: https://doi.org/10.1103/ghz6-w27b

Abstract

We consider a novel bounce universe model constructed within the framework of Horndeski gravity. We have analyzed the bispectrum of primordial scalar perturbations and evaluated the corresponding non-Gaussianities for this specific model. The nonlinear parameter fNL was computed for various wave vector configurations, including: (i) the local configuration, (ii) the equilateral configuration, and (iii) the enfolded configuration, which is a linear combination of the equilateral and orthogonal shapes. We demonstrate that the observational constraints on the scalar spectrum index tilt and the scalar-to-tensor ratio, together with the unitarity bounds, ensure that the bounds from non-Gaussianities are trivially satisfied. Therefore, this particular bounce universe scenario is fully viable in light of modern observational data.

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Outline

Information

Phys. Rev. D 112, 063526– Published 15 September, 2025
  • Received 29 October 2024
  • Accepted 22 August 2025
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