Inflation in Extra-Dimensions with one or two branes
Fuente:
arXiv
Gespeichert in:
| Hauptverfasser: | , , , |
|---|---|
| Format: | Preprint |
| Veröffentlicht: |
2026
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1866917187139141632 |
|---|---|
| author | Bernal, Nicolás Cosme, Catarina Donini, Andrea Rius, Nuria |
| author_facet | Bernal, Nicolás Cosme, Catarina Donini, Andrea Rius, Nuria |
| contents | In this paper, we study two inflationary models, namely, monomial inflation and the simplest $α$-attractor inflation, within extra-dimensional frameworks. We consider three extra-dimensional setups: Dark Dimension, which embeds one flat extra-dimension to explain the observed smallness of the 4D cosmological constant $Λ_4$; and the two Randall-Sundrum scenarios with one warped extra-dimension, namely RS1 with two branes and RS2 with one brane. We derive the corresponding Friedmann equations, compute the slow-roll parameters in each case, and we fit the experimental data for ($n_s - 1$, $α$, $Δ_s^2$, $r$), using Planck, BICEP, and ACT data. We find that monomial inflation is strongly disfavored in all scenarios, while $α$-attractor inflation provides an excellent fit to current observations, with extra-dimensional setups offering additional flexibility compared to the standard 4D case. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_02982 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Inflation in Extra-Dimensions with one or two branes Bernal, Nicolás Cosme, Catarina Donini, Andrea Rius, Nuria High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Physics - Theory In this paper, we study two inflationary models, namely, monomial inflation and the simplest $α$-attractor inflation, within extra-dimensional frameworks. We consider three extra-dimensional setups: Dark Dimension, which embeds one flat extra-dimension to explain the observed smallness of the 4D cosmological constant $Λ_4$; and the two Randall-Sundrum scenarios with one warped extra-dimension, namely RS1 with two branes and RS2 with one brane. We derive the corresponding Friedmann equations, compute the slow-roll parameters in each case, and we fit the experimental data for ($n_s - 1$, $α$, $Δ_s^2$, $r$), using Planck, BICEP, and ACT data. We find that monomial inflation is strongly disfavored in all scenarios, while $α$-attractor inflation provides an excellent fit to current observations, with extra-dimensional setups offering additional flexibility compared to the standard 4D case. |
| title | Inflation in Extra-Dimensions with one or two branes |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Physics - Theory |
| url | https://arxiv.org/abs/2601.02982 |