Interpreting cosmological tensions from the effective field theory of torsional gravity

Sheng-Feng Yan, Pierre Zhang, Jie-Wen Chen, Xin-Zhe Zhang, Yi-Fu Cai and Emmanuel N. Saridakis

Go to the profile of Nature Communications
Oct 17, 2019
0
0

Received Date: 26th September 19

Cosmological tensions can arise within $\Lambda$CDM scenario amongst different observational windows, which may indicate new physics beyond the standard paradigm if confirmed by measurements. In this article, we report how to alleviate both the $H_0$ and $\sigma_8$ tensions simultaneously within torsional gravity from the perspective of effective field theory (EFT). Following these observations we construct concrete models of Lagrangians of torsional gravity. Specifically, we consider the parameterization $f(T)=-T-2\Lambda/M_P^2+\alpha T^\beta$, where two out of the three parameters are independent. This model can efficiently fit observations solving all statistical tensions. To our knowledge, this is the first time where a modified gravity theory can alleviate both $H_0$ and $\sigma_8$ tensions simultaneously, hence offering an additional argument in favor of gravitational modification.

Read in full at arXiv.

This is an abstract of a preprint hosted on an independent third party site. It has not been peer reviewed but is currently under consideration at Nature Communications.

Go to the profile of Nature Communications

Nature Communications

Nature Research, Springer Nature