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| Format: | Preprint |
| Veröffentlicht: |
2025
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| Online-Zugang: | https://arxiv.org/abs/2507.15812 |
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| _version_ | 1866909705050259456 |
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| author | Younesizadeh, Feyzollah Kamani, Davoud |
| author_facet | Younesizadeh, Feyzollah Kamani, Davoud |
| contents | We investigate the inflation for the quartic hilltop model via a certain type of modified gravity. Precisely, we analyze the $F(ϕ) T$ term in the Einstein's gravity to examine the quartic hilltop inflation model. $T$ is the trace of the energy-momentum tensor, and $ϕ$ is the inflaton field. Next, we calculate the inflation dynamics for the foregoing model and obtain the slow-roll parameters, i.e., the scalar spectral index ``$n_s$'' and the tensor-to-scale ratio ``$r$'', which these parameters exhibit high sensitivity to the $F(ϕ) T$ term. This modified form of the gravity is not only in accordance with the predictions of the original model but also allows for better prediction of the Planck/BICEP/Keck data. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_15812 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The Inflationary Quartic Hilltop Model in a Modified Gravity and Its Comparison with the Observations Younesizadeh, Feyzollah Kamani, Davoud General Relativity and Quantum Cosmology We investigate the inflation for the quartic hilltop model via a certain type of modified gravity. Precisely, we analyze the $F(ϕ) T$ term in the Einstein's gravity to examine the quartic hilltop inflation model. $T$ is the trace of the energy-momentum tensor, and $ϕ$ is the inflaton field. Next, we calculate the inflation dynamics for the foregoing model and obtain the slow-roll parameters, i.e., the scalar spectral index ``$n_s$'' and the tensor-to-scale ratio ``$r$'', which these parameters exhibit high sensitivity to the $F(ϕ) T$ term. This modified form of the gravity is not only in accordance with the predictions of the original model but also allows for better prediction of the Planck/BICEP/Keck data. |
| title | The Inflationary Quartic Hilltop Model in a Modified Gravity and Its Comparison with the Observations |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2507.15812 |