Modified Gravity Tomography

TL;DR

This paper introduces a parameterization of modified gravity effects via scalar field dynamics, enabling easier analysis of local constraints and large-scale structure impacts across different scales.

Contribution

It presents a novel framework linking scalar field properties to gravity modifications, simplifying the analysis of constraints and structure formation.

Findings

Scalar field mass and coupling variations capture modified gravity effects.

Framework facilitates analysis of local and large-scale gravity constraints.

Enhances understanding of gravity modifications across scales.

Abstract

We consider the effect of a scalar field degree of freedom on the dynamics of gravity from small to large scales. We show that the effects of modified gravity can be completely captured by the time variations of the scalar field mass and its coupling to matter. This leads to a parameterisation of modified gravity where local constraints are easy to analyse and large scale scale structure effects apparent.