Comment on "Einstein's Other Gravity and the Acceleration of the Universe''

TL;DR

This paper critiques a specific exponential $f(T)$ gravity model, demonstrating that it cannot achieve the crossing of the phantom divide line in dark energy equation of state, thus constraining its cosmological viability.

Contribution

It provides a critical analysis showing the limitations of Linder's exponential $f(T)$ model regarding dark energy behavior.

Findings

The model cannot cross the phantom divide line $w_{DE}=-1$.

Constraints on $f(T)$ models for realistic dark energy evolution.

Highlights limitations of exponential $f(T)$ gravity models.

Abstract

We show that in the exponential $f(T)$ model studied by E. Linder [arXiv:1005.3039, Phys.Rev.D 81, 127301 (2010)], it is impossible to have the crossing of the phantom divide line $w_{\mathrm{DE}}=-1$.