The primordial non-Gaussianities for non-singular Horndeski cosmologies
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arXiv
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| Hauptverfasser: | , , |
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| Format: | Preprint |
| Veröffentlicht: |
2024
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| _version_ | 1866912552356675584 |
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| author | Ageeva, Y. Kotenko, M. Petrov, P. |
| author_facet | Ageeva, Y. Kotenko, M. Petrov, P. |
| contents | 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 non-linear parameter $f_{\text{NL}}$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_10742 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The primordial non-Gaussianities for non-singular Horndeski cosmologies Ageeva, Y. Kotenko, M. Petrov, P. High Energy Physics - Theory General Relativity and Quantum Cosmology 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 non-linear parameter $f_{\text{NL}}$ 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. |
| title | The primordial non-Gaussianities for non-singular Horndeski cosmologies |
| topic | High Energy Physics - Theory General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2410.10742 |