Cosmological models in scalar tensor theories of gravity and observations: a class of general solutions

TL;DR

This paper explores scalar tensor cosmological models with inverse power law potentials, deriving exact solutions and comparing their predictions with various observational data to understand the universe's accelerating expansion.

Contribution

It provides a class of exact solutions in scalar tensor theories and evaluates their consistency with multiple cosmological observations.

Findings

Models can fit supernova and gamma-ray burst data

Predictions align with large scale structure measurements

Results support scalar tensor theories as viable explanations for acceleration

Abstract

We consider cosmological models in scalar tensor theories of gravity that describe an accelerating universe, and we study a family of inverse power law potentials, for which exact solutions of the Einstein equations are known. We also compare theoretical predictions of our models with observations. For this we use the following data: the publicly available catalogs of type Ia supernovae and high redshift Gamma Ray Bursts, the parameters of large scale structure determined by the 2-degree Field Galaxy Redshift Survey (2dFGRS), and measurements of cosmological distances based on the Sunyaev-Zel'dovich effect, among others.