Alleviating $H_0$ tension in scalar-tensor and bi-scalar-tensor theories

Abstract

We investigate scalar-tensor and bi-scalar-tensor modified theories of gravity that can alleviate the $H_0$ tension. In the first class of theories we show that choosing particular models with shift-symmetric friction term we are able to alleviate the tension by obtaining smaller effective Newton's constant at intermediate times, a feature that cannot be easily obtained in modified gravity. In the second class of theories, which involve two extra propagating degrees of freedom, we show that the $H_0$ tension can be alleviated, and the mechanism behind it is the phantom behavior of the effective dark-energy equation-of-state parameter. Hence, scalar-tensor and bi-scalar-tensor theories have the capability of alleviating $H_0$ tension with both known sufficient late-time mechanisms.

20 pages, 4 figures, Invited Contribution to Universe Special Issue "Modified Gravity Approaches to the Tensions of LambdaCDM", with Editors Eleonora Di Valentino, Leandros Perivolaropoulos, Jackson Levi Said

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