English

Can $f(T)$ gravity resolve the $H_0$ tension?

Cosmology and Nongalactic Astrophysics 2020-09-30 v3 General Relativity and Quantum Cosmology

Abstract

Motivated by the discrepancy in measurements of H0H_0 between local and global probes, we investigate whether teleparallel gravities could be a better model to describe the present days observations or at least to alleviate the H0H_0 tension. Specifically, in this work we study and place constraints on three popular f(T)f(T) models in light of the Planck-2018 CMB data release. We find that the f(T)f(T) power-law model can alleviate the H0H_0 tension from 4.4σ4.4\sigma to 1.9σ1.9\sigma level, while the f(T)f(T) model of two exponential fail to resolve this inconsistency. Moreover, for the first time, we obtain constraints on the effective number of relativistic species NeffN_{eff} and on the sum of the neutrino masses Σmν\Sigma m_\nu in f(T)f(T) gravity. We find that the constraints obtained are looser than in Λ\LambdaCDM. However, the introduction of massive neutrinos into the cosmological model alleviate the H0H_0 tension for the power-law model. Finally, we find that whether a viable f(T)f(T) theory can mitigate the H0H_0 tension depends on the mathematical structure of the distortion factor y(z,b)y(z,\,b). These results could provide a clue for theoreticians to write a more physical-motivated expression of f(T)f(T) function.

Keywords

Cite

@article{arxiv.2003.10095,
  title  = {Can $f(T)$ gravity resolve the $H_0$ tension?},
  author = {Deng Wang and David Mota},
  journal= {arXiv preprint arXiv:2003.10095},
  year   = {2020}
}

Comments

13 pages, 8 figs. figs and refs added. Accepted in PRD