Power spectrum of large-scale structure cosmological models in the framework of scalar-tensor theories

TL;DR

This paper investigates how scalar-tensor theories, as alternatives to general relativity, influence the large-scale structure formation and the resulting power spectrum of the universe.

Contribution

It provides a detailed analysis of the Newtonian limit and evolution equations in scalar-tensor theories, and computes the current power spectrum considering scalar field effects.

Findings

Large-scale structure depends on scalar field contribution

Power spectrum differs from standard models due to scalar-tensor effects

Scalar-tensor theories can modify structure formation predictions

Abstract

We study the large-scale structure formation in the Universe in the frame of scalar-tensor theories as an alternative to general relativity. We review briefly the Newtonian limit of non-minimally coupled scalar-tensor theories and the evolution equations of the $N$-body system that is appropriate to study large-scale structure formation in the Universe. We compute the power-spectrum of the universe at present epoch and show how the large-scale structure depends on the scalar field contribution.