Abstract
We explore the properties of dark energy from recent observational data, including the Gold SneIa, the baryonic acoustic oscillation peak from SDSS, the CMB shift parameter from WMAP3,the x-ray gas mass fraction in clusters and the Hubble parameter versus redshift. TheΛCDM model with curvature and two parameterized dark energy models are studied. For theΛCDM model, we find that the flat universe is consistent with observations at the1σ confidence level and a closed universe is slightly favored by these data. For twoparameterized dark energy models, with the prior given on the present matter density,Ωm0,with Ωm0 = 0.24, Ωm0 = 0.28 and Ωm0 = 0.32, our result seems to suggest that the trend ofΩm0 dependence for an evolving dark energy from a combination of the observational datasets ismodel-dependent.
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