Scalar-tensor theories are frequently only consistent with fifth force constraints in the presence of a screening mechanism, namely in order to suppress an otherwise unacceptably large coupling between the scalar and ordinary matter. Here we investigate precisely which subsets of Horndeski theories do not give rise to and/or require such a screening mechanism. We investigate these subsets in detail, deriving their form and discussing how they are restricted upon imposing additional bounds from the speed of gravitational waves, solar system tests and cosmological observables. Finally, we also identify what subsets of scalar-tensor theories precisely recover the predictions of standard (linearised) ΛCDM cosmologies in the quasi-static limit.

Scalar-tensor cosmologies without screening

Noller J.;Santoni L.;Trincherini E.;Trombetta L. G.
2021

Abstract

Scalar-tensor theories are frequently only consistent with fifth force constraints in the presence of a screening mechanism, namely in order to suppress an otherwise unacceptably large coupling between the scalar and ordinary matter. Here we investigate precisely which subsets of Horndeski theories do not give rise to and/or require such a screening mechanism. We investigate these subsets in detail, deriving their form and discussing how they are restricted upon imposing additional bounds from the speed of gravitational waves, solar system tests and cosmological observables. Finally, we also identify what subsets of scalar-tensor theories precisely recover the predictions of standard (linearised) ΛCDM cosmologies in the quasi-static limit.
2021
Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici
Dark energy theory; Modified gravity; astro-ph.CO; astro-ph.CO; General Relativity and Quantum Cosmology; High Energy Physics - Theory
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/101175
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