Cosmological constraints of Palatini f(ℛ) gravity
Débora Aguiar Gomes, Rebecca Briffa, Aleksander Kozak, Jackson Levi Said, Margus Saal, Aneta Wojnar
Abstract
Abstract In this study, we investigate a Palatini f ( R ) gravity model featuring a quadratic term correction, aligning it with the most recent expansion rate data, with a particular focus on the latest SNIa and BAO data. Our analysis employs CC data as the fundamental dataset, complemented by contributions from the SN sample and a combination of non-overlapping transversal BAO datasets. We conduct a comprehensive MCMC analysis for each data set combination, yielding constraints on all cosmological parameters within the model. Additionally, we incorporate the latest Hubble constant value from the SH0ES Team. Finally, we present a statistical comparison between the Palatini quadratic model and ΛCDM using the AIC and BIC metrics, ultimately obtaining the constraint | α | ≤ 10 49 m 2 . We also stress the significance of studying stellar and substellar objects for obtaining more precise constraints on modified gravity compared to those derived from cosmological observations.