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| Main Authors: | , |
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| Format: | Preprint |
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2024
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| Online Access: | https://arxiv.org/abs/2409.02975 |
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| _version_ | 1866909380206657536 |
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| author | Capistrano, Abraão J. S. Kremer, Gilberto M. |
| author_facet | Capistrano, Abraão J. S. Kremer, Gilberto M. |
| contents | We consider slow-roll inflation in the context of a modified Brans-Dicke dilaton gravity. From a two self-interacting potentials $V(ϕ)$, we reproduce a Starobinsky-like potential and, commonly in syperstring models, an exponential tail potential $V(ϕ)\sim(1-e^{α_0ϕ})$, with $α_0$ being a constant coefficient related to the Brans-Dicke parameter $ω$. Using the observational bounds on the spectral index $n_s$ and tensor-to-scalar ratio $r$ imposed by Planck-CMB baseline data and the BICEP2/Keck collaboration with combination with Planck 2018 and the Baryonic Acoustic Oscillations(BAO), we obtain for both models a good agreement with current observations with $n_s = 0.960 - 0.972$ and $r<0.02$. In addition, the resulting large values of $ω$ suggests a possible linkage of the inflationary regime and today's solar system bounds. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_02975 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Slow-roll inflation from a geometric scalar-tensor model with self-interacting potentials Capistrano, Abraão J. S. Kremer, Gilberto M. General Relativity and Quantum Cosmology We consider slow-roll inflation in the context of a modified Brans-Dicke dilaton gravity. From a two self-interacting potentials $V(ϕ)$, we reproduce a Starobinsky-like potential and, commonly in syperstring models, an exponential tail potential $V(ϕ)\sim(1-e^{α_0ϕ})$, with $α_0$ being a constant coefficient related to the Brans-Dicke parameter $ω$. Using the observational bounds on the spectral index $n_s$ and tensor-to-scalar ratio $r$ imposed by Planck-CMB baseline data and the BICEP2/Keck collaboration with combination with Planck 2018 and the Baryonic Acoustic Oscillations(BAO), we obtain for both models a good agreement with current observations with $n_s = 0.960 - 0.972$ and $r<0.02$. In addition, the resulting large values of $ω$ suggests a possible linkage of the inflationary regime and today's solar system bounds. |
| title | Slow-roll inflation from a geometric scalar-tensor model with self-interacting potentials |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2409.02975 |