Rebecca Briffa

Rebecca Briffa

The ΛCDM model has encountered challenges, including the H_0 and S_8 tensions, potentially hinting at the need for new physics. Resolving both tensions within one framework would boost confidence in any alternative particular model, potentially necessitating exploration beyond General Relativity. Modifications, such as Teleparallel Gravity, which is a torsion-based approach, offers alternatives. This study examines prominent f(T) gravity models using late-time cosmological datasets, including Hubble measurements, Pantheon+ supernovae, and DESI BAO data. Growth rate measurements via f\sigma_8 data are also analysed to address the S_8 tension. Additionally, we explore primordial gravitational waves and their effects on CMB anisotropies and B-mode polarization, by leveraging BICEP/Keck data. By integrating these diverse datasets, we achieve a comprehensive understanding of both the late-time Universe and the tensor perturbations within the f(T) framework, contributing to a deeper comprehension of its dynamics and its potential to resolve long-standing cosmological tensions.