Browsing Faculty of Natural Sciences by Author "Braglia, Matteo"
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Cosmological constraints on post-Newtonian parameters in effectively massless scalar-tensor theories of gravity
Rossi, Massimo; Ballardini, Mario; Braglia, Matteo (2019)We study the cosmological constraints on the variation of Newton’s constant and on post-Newtonian parameters for simple models of the scalar-tensor theory of gravity beyond the extended Jordan-BransDicke theory. We restrict ... -
Larger value for H0 by an evolving gravitational constant
Ballardini, Mario; Braglia, Matteo; Emond, William T. (American Physical Society, 2020)We provide further evidence that a massless cosmological scalar field with a nonminimal coupling to the Ricci curvature of the type M 2 pl ( 1 + ξ σ n / M n pl ) alleviates the existing tension between ... -
Scalar-tensor theories of gravity, neutrino physics, and the H0 tension
Ballardini, Mario; Braglia, Matteo; Finelli, Fabio (IOP Publishing, 2020)We use Planck 2018 data to constrain the simplest models of scalar-tensor theories characterized by a coupling to the Ricci scalar of the type F(σ)R with F(σ) = N2 pl + ξσ2 . We update our results with previous Planck ...