Observational information for f(T) theories and Dark Torsion

TL;DR

This paper evaluates f(T) theories of gravity using diverse observational data, revealing that combined BAO/CMB constraints differ from prior studies and that including Hubble data favors a phantom-like equation of state, challenging LambdaCDM.

Contribution

It provides a comprehensive joint analysis of multiple observational data sets to constrain f(T) theories and highlights differences from previous constraints, especially when including Hubble data.

Findings

Combined BAO/CMB constraints differ from previous results.

Including Hubble data excludes LambdaCDM at one sigma.

Effective equation of state tends to be of phantom type.

Abstract

In the present work we analyze and compare the information coming from different observational data sets in the context of a sort of f(T) theories. We perform a joint analysis with measurements of the most recent type Ia supernovae (SNe Ia), Baryon Acoustic Oscillation (BAO), Cosmic Microwave Background radiation (CMB), Gamma-Ray Bursts data (GRBs) and Hubble parameter observations (OHD) to constraint the only new parameter these theories have. It is shown that when the new combined BAO/CMB parameter is used to put constraints, the result is different from previous works. We also show that when we include Observational Hubble Data (OHD) the simpler LambdaCDM model is excluded to one sigma level, leading the effective equation of state of these theories to be of phantom type. Also, analyzing a tension criterion for SNe Ia and other observational sets, we obtain more consistent and better suited data sets to work with these theories.