Large field polynomial inflation in Palatini f(R,ϕ) gravity
Journal of Cosmology and Astroparticle Physics, cilt.2025, sa.1, 2025 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 2025 Sayı: 1
- Basım Tarihi: 2025
- Doi Numarası: 10.1088/1475-7516/2025/01/115
- Dergi Adı: Journal of Cosmology and Astroparticle Physics
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, INSPEC, zbMATH
- Anahtar Kelimeler: inflation, modified gravity
- Marmara Üniversitesi Adresli: Evet
Özet
In this paper, we employ the Palatini formalism to investigate the dynamics of large-field inflation using a renormalizable polynomial inflaton potential in the context of f(R,ϕ) gravity. Assuming instant reheating, we make a comparative analysis of large-field polynomial inflation (PI). We first consider the minimal and non-minimal coupling of inflaton in R gravity, and then we continue with the minimally and non-minimally coupled inflaton in f(R,ϕ) gravity. We scan the parameter space for the inflationary predictions (n s and r) consistent with the Planck and BICEP/Keck 2018 results as well as the sensitivity forecast of the future CMB-S4 and depict the compliant regions in the ϕ 0-β plane where ϕ 0 and β are two parameters of polynomial inflation model which control the saddle point of the potential and the flatness in the vicinity of this point respectively. We find that a substantial portion of the parameter space aligns with the observational data.