2020/07/31 by S. Santos da Costa, M. Benetti, Micol Benetti +5
Physics and Astronomy · #Black Holes and Theoretical Physics #Brane #Cosmic microwave background #Cosmology and Gravitation Theories #Einstein #Galaxies: Formation, Evolution, Phenomena #Inflation (cosmology) #Mathematical physics #Physics #Quantum mechanics #Robustness (evolution) #Theoretical physics #astro-ph.CO #gr-qc
paper · pdf · doi:10.1140/epjp/s13360-020-01015-1
published as Eur. Phys. J. Plus (2021) 136:84 · 10 pages, 5 figures, 2 tables
openalex publication_date 2021/01/01 · arxiv created 2021/01/26 · arxiv updated 2021/01/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The first inflationary model conceived was the one proposed by Starobinsky which includes an additional term quadratic in the Ricci-scalar R in the Einstein-Hilbert action. The model is now considered a target for several future cosmic microwave background experiments given its compatibility with current observational data. In this paper, we analyse the robustness of the Starobinsky inflation by inserting it into a generalized scenario based on a β-Starobinsky inflation potential, which is motivated through brane inflation. In the Einstein frame, the generalized model recovers the original model for β=0, whereas ∀ β≠ 0 represents an extended class of models that admit a wider range of solutions. We investigate limits on β from current cosmic microwave background and baryonic acoustic oscillation data and find that only a small deviation from the original scenario is allowed, β=-0.08 ± 0.12 (68% C.L.), which is fully compatible with zero and confirms the robustness of the Starobinsky inflationary model in light of current observations.