Testing teleparallel cosmology using late-time observation

Abstract

The interest in modified theories of gravity has increased, motivated by shortcomings and tensions present in ΛCDM. f(T) represents one class of theories which constitutes an extension of the teleparallel framework, an alternative to general relativity. In this work several forms of f(T) motivated in literature were considered which add only one new parameter. The cosmologies they imply through their Friedmann equations were examined using Markov Chain Monte Carlo methods to constrain key cosmological parameters using three late-time observational data sets in combination with two relevant priors. By and large the models predict values of H0 in agreement with ΛCDM, but predict overall larger values of Ωm,0. When baryon acoustic oscillation data is added the models predict larger values for both H0 and Ωm,0. The models are also seen to be statistically favoured over ΛCDM when this data was added.