Reconstructing the properties of dark energy from recent observations

TL;DR

This paper analyzes recent observational data to constrain dark energy properties, finding that a flat universe is consistent with observations and that dark energy evolution depends on the matter density prior.

Contribution

It provides a comprehensive analysis of dark energy models using multiple observational data sets, highlighting the dependence of results on matter density priors.

Findings

Flat universe consistent with data at 1σ confidence level

Closed universe slightly favored by observations

Dark energy evolution trend depends on matter density prior

Abstract

We explore the properties of dark energy from recent observational data, including the Gold Sne Ia, the baryonic acoustic oscillation peak from SDSS, the CMB shift parameter from WMAP3, the X-ray gas mass fraction in cluster and the Hubble parameter versus redshift. The $\Lambda CDM$ model with curvature and two parameterized dark energy models are studied. For the $\Lambda CDM$ model, we find that the flat universe is consistent with observations at the $1\sigma$ confidence level and a closed universe is slightly favored by these data. For two parameterized dark energy models, with the prior given on the present matter density, $\Omega_{m0}$, with $\Omega_{m0}=0.24$, $\Omega_{m0}=0.28$ and $\Omega_{m0}=0.32$, our result seems to suggest that the trend of $\Omega_{m0}$ dependence for an evolving dark energy from a combination of the observational data sets is model-dependent.