Interpreting cosmological tensions from the effective field theory of torsional gravity

Abstract

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 parametrization $f(T)=-T-2\Lambda /M_P^2+\alpha T^{\beta }$, where two out of the three parameters are independent. This model can efficiently fit observations solving the two 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.

7 pages, 3 figures

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