Updating constraints on phantom crossing $f(T)$ gravity

TL;DR

This paper constrains $f(T)$ gravity models supporting phantom crossing of dark energy's equation of state, showing they fit current data well and may alleviate the Hubble tension without worsening growth tension.

Contribution

It provides the first comprehensive constraints on $f(T)$ gravity with phantom crossing, demonstrating its viability and potential to address cosmic tensions.

Findings

Phantom crossing scenario is favored by data.

$f(T)$ model is statistically comparable to $\\Lambda$CDM.

Potential to alleviate Hubble tension without worsening growth tension.

Abstract

We establish constraints on $f(T)$ gravity by considering the possibility of a scenario that supports a phantom crossing of the equation of state parameter $\omega_{DE}$. After determining the viable parameter space of the model, while checking the impact on the background dynamics, we perform an analysis to obtain constraints on cosmological parameters and determine the viability of this scenario. To this end, we use combined data sets from cosmic chronometers (CC), baryonic acoustic oscillations (BAO), redshift space distortion (RSD) and Type Ia supernovae (SN) measurements from the latest Pantheon$+$ set, in which the impact on the absolute magnitude due to the change of the effective gravitational constant is also considered. It is found that a state where a phantom crossing of $\omega_{DE}$ happens is favored by data, and the $f(T)$ model is competitive with the $\Lambda$CDM one by statistical criteria, such as AIC and BIC. Additionally, we find evidence of the Hubble tension being alleviated within the $f(T)$ model, at the same time that it does not worsen the growth one, indicating a possibility of the present scenario as an option to address the current cosmic tensions.