Can $f(T)$ gravity resolve the $H_0$ tension?. (arXiv:2003.10095v3 [astro-ph.CO] UPDATED)
<a href="http://arxiv.org/find/astro-ph/1/au:+Wang_D/0/1/0/all/0/1">Deng Wang</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Mota_D/0/1/0/all/0/1">David Mota</a>

Motivated by the discrepancy in measurements of $H_0$ 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
$H_0$ tension. Specifically, in this work we study and place constraints on
three popular $f(T)$ models in light of the Planck-2018 CMB data release. We
find that the $f(T)$ power-law model can alleviate the $H_0$ tension from
$4.4sigma$ to $1.9sigma$ level, while the $f(T)$ model of two exponential
fail to resolve this inconsistency. Moreover, for the first time, we obtain
constraints on the effective number of relativistic species $N_{eff}$ and on
the sum of the neutrino masses $Sigma m_nu$ in $f(T)$ gravity. We find that
the constraints obtained are looser than in $Lambda$CDM. However, the
introduction of massive neutrinos into the cosmological model alleviate the
$H_0$ tension for the power-law model. Finally, we find that whether a viable
$f(T)$ theory can mitigate the $H_0$ tension depends on the mathematical
structure of the distortion factor $y(z,,b)$. These results could provide a
clue for theoreticians to write a more physical-motivated expression of $f(T)$
function.

Motivated by the discrepancy in measurements of $H_0$ 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
$H_0$ tension. Specifically, in this work we study and place constraints on
three popular $f(T)$ models in light of the Planck-2018 CMB data release. We
find that the $f(T)$ power-law model can alleviate the $H_0$ tension from
$4.4sigma$ to $1.9sigma$ level, while the $f(T)$ model of two exponential
fail to resolve this inconsistency. Moreover, for the first time, we obtain
constraints on the effective number of relativistic species $N_{eff}$ and on
the sum of the neutrino masses $Sigma m_nu$ in $f(T)$ gravity. We find that
the constraints obtained are looser than in $Lambda$CDM. However, the
introduction of massive neutrinos into the cosmological model alleviate the
$H_0$ tension for the power-law model. Finally, we find that whether a viable
$f(T)$ theory can mitigate the $H_0$ tension depends on the mathematical
structure of the distortion factor $y(z,,b)$. These results could provide a
clue for theoreticians to write a more physical-motivated expression of $f(T)$
function.

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