Crossing SNe Ia and BAO observational constraints with local ones in hybrid metric-Palatini gravity

Abstract

In this paper, we consider the recently proposed hybrid metric-Palatini gravitational theory, which consists of adding to the Einstein-Hilbert Lagrangian an $f(\mathcal{R})$ term constructed à la Palatini. Using the respective dynamically equivalent scalar-tensor representation, we explore the cosmological evolution of a specific model, given by $f(\mathcal{R})\propto {\mathcal{R}}^2$, and obtain constraints on the free parameters by using different sources of cosmological data. The viability of the model is analysed by combining the conditions imposed by the Supernovae Ia and Baryonic Acoustic Oscillations data and the results are compared with the local constraints.

arXiv comment10 pages, 2 figures, analysis extended, version to be published in Phys. Rev. D

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