Probing Reheating in a Decaying Oscillatory Inflationary Model with Latest ACT Constraints
Fuente:
arXiv
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866911116976717824 |
|---|---|
| author | Chen, Li-Yang Zha, Rongrong Zhang, Feng-Yi |
| author_facet | Chen, Li-Yang Zha, Rongrong Zhang, Feng-Yi |
| contents | Recent observations from the Atacama Cosmology Telescope (ACT) indicate a moderate upward shift in the scalar spectral index $n_s$ compared to Planck $2018$, thereby placing tighter constraints on inflationary scenarios. Motivated by these results, we investigate a decaying oscillatory Inflationary model inspired by minimal no-scale supergravity, characterized by the potential $V(ϕ) = λϕ^{2n} \sin^2(l/ϕ^n)$. We perform a numerical analysis of the background dynamics and reheating process across a range of model parameters. The model yields robust predictions for $n_s$ and the tensor-to-scalar ratio $r$, in excellent agreement with current ACT data. Successful reheating in this model requires a large effective equation-of-state parameter approaching unity, consistent with both cosmic microwave background (CMB) and big bang nucleosynthesis (BBN) constraints. The corresponding number of inflationary $e$-folds increases with $n$ and is weakly sensitive to $l$. Overall, the model offers a simple yet predictive framework that captures both inflationary dynamics and post-inflationary reheating, and remains viable under the latest high-precision observations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_16538 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Probing Reheating in a Decaying Oscillatory Inflationary Model with Latest ACT Constraints Chen, Li-Yang Zha, Rongrong Zhang, Feng-Yi Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology Recent observations from the Atacama Cosmology Telescope (ACT) indicate a moderate upward shift in the scalar spectral index $n_s$ compared to Planck $2018$, thereby placing tighter constraints on inflationary scenarios. Motivated by these results, we investigate a decaying oscillatory Inflationary model inspired by minimal no-scale supergravity, characterized by the potential $V(ϕ) = λϕ^{2n} \sin^2(l/ϕ^n)$. We perform a numerical analysis of the background dynamics and reheating process across a range of model parameters. The model yields robust predictions for $n_s$ and the tensor-to-scalar ratio $r$, in excellent agreement with current ACT data. Successful reheating in this model requires a large effective equation-of-state parameter approaching unity, consistent with both cosmic microwave background (CMB) and big bang nucleosynthesis (BBN) constraints. The corresponding number of inflationary $e$-folds increases with $n$ and is weakly sensitive to $l$. Overall, the model offers a simple yet predictive framework that captures both inflationary dynamics and post-inflationary reheating, and remains viable under the latest high-precision observations. |
| title | Probing Reheating in a Decaying Oscillatory Inflationary Model with Latest ACT Constraints |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2508.16538 |