Quasi-Newtonian Cosmological Models in Scalar-Tensor Theories of Gravity

TL;DR

This paper investigates shear-free cosmological dust models within scalar-tensor gravity theories, focusing on their integrability, evolution, and perturbation solutions to understand their cosmological implications.

Contribution

It presents the integrability conditions and covariant propagation equations for quasi-Newtonian models in scalar-tensor theories, a novel analysis in this context.

Findings

Derived integrability conditions for consistent evolution.

Formulated covariant density and velocity propagation equations.

Analyzed solutions to the perturbation equations.

Abstract

In this contribution, classes of shear-free cosmological dust models with irrotational fluid flows will be investigated in the context of scalar-tensor theories of gravity. In particular, the integrability conditions describing a consistent evolution of the linearised field equations of quasi-Newtonian universes are presented. We also derive the covariant density and velocity propagation equations of such models and analyse the corresponding solutions to these perturbation equations.