Scalar field models of dark energy with barotropic equation of state: properties and observational constraints from different datasets

TL;DR

This paper investigates scalar field dark energy models with barotropic equations of state, analyzing observational constraints from various datasets and exploring future prospects for model differentiation using CMB data.

Contribution

It provides new constraints on dark energy parameters from combined datasets and discusses the potential to distinguish models with future CMB observations.

Findings

Initial dark energy equation of state is weakly constrained by current data.

Combined datasets improve constraints on dark energy parameters.

Future CMB data may help differentiate between dark energy models.

Abstract

The possibility of constraining the parameters of scalar field dark energy with barotropic equation of state using different available datasets is discussed. It has been found that the initial value of dark energy equation of state parameter is constrained very weakly by most of the data. We have determined the constraints on this parameter, which come from the combined dataset including supernovae from the full SDSS compilation with the MLCS2k2 fitting of light curves. We discuss also the possibility of distinguishing between different dark energy models with barotropic equation of state using the future data on CMB anisotropies.