Restrições de modelos inflacionários: exponencial utilizando dados da radiação cósmica de fundo

Abstract

In recent years the inflationary scenario has become one of the most important models in the description of the early Universe. It initially emerges as a solution to problems of the standard cosmology, but has come to stand out mainly as the mechanism capable of generating the initial perturbations that gave rise to the large-scale structures of the Universe. Its theoretical predictions can be tested with the current observational data, which allows to constrain several classes of inflationary models from the literature. Thus in this work we analyze a class of generalized inflationary models proposed by Alcaniz and Carvalho [1], known as β-exponential inflation, and we show that this type of potential can arise in the context of the brane cosmology, in which the field describing the size of the extra dimension is interpreted as the inflaton. We discuss the observational viability of this class of models in the light of the latest Cosmic Microwave Background (CMB) data, obtained by the Planck satellite, through a Bayesian analysis and impose constraints on the model parameters. We verified that the CMB data alone weakly prefer the minimal standard ΛCDM model over the β-exponential inflation. However, when current local measurements of the Hubble parameter, H0, are considered, the β-exponencial model is moderately preferred over the ΛCDM cosmology, making the study of this class of inflationary models interesting in the context of the current H0 tension.