A new f(T) gravity model that reproduces the ΛsCDM background but modifies structure growth via an effective Newton's constant is constructed and constrained with RSD data, yielding a 2σ preference for a non-zero growth-modifying parameter.
Testing $f(T)$ cosmologies with HII Hubble diagram and CMB distance priors
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abstract
In this work, we present independent determinations of cosmological parameters and new constraints on $f(T)$ cosmologies, employing two new catalogs related to HII galaxy Hubble and CMB distance priors, along with the local standard measurements, SNIa, $H(z)$ measurements, growth rate data (RSD), and BAO baselines. We found that the marginalised best-fit C.L. $H_0$ and $\sigma_8$ parameters within these cosmologies can relax the current cosmological tensions using HIIG data. This produces a larger range of admissible values for the current Hubble constant, and when all baselines are considered, the uncertainty bands for $H_0$ and the matter density parameter reduce significantly.
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Mapping the $\Lambda_{\rm s}$CDM scenario to $f(T)$ modified gravity: Effects on structure growth rate
A new f(T) gravity model that reproduces the ΛsCDM background but modifies structure growth via an effective Newton's constant is constructed and constrained with RSD data, yielding a 2σ preference for a non-zero growth-modifying parameter.