Work

Primordial non-Gaussianities for nonsingular Horndeski cosmologies

Year: 2025

Type: article

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 f NL 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.

Source: Physical review. D/Physical review. D.

DOI: 10.1103/ghz6-w27b

Authors: Y. Ageeva, M. Kotenko, P. Petrov

Institutions: Lomonosov Moscow State University, Institute for Nuclear Research, Institute for Basic Science

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Funders: Russian Science Foundation, Institute for Basic Science, Foundation for the Advancement of Theoretical Physics and Mathematics

Awards: G4487476711, G727276852