2007/10/10 by Puxun Wu, Hongwei Yu · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #astro-ph
paper · pdf · doi:10.1088/1475-7516/2007/10/014
published as JCAP0710:014,2007 · 16 pages, 15 figures, To appear in JCAP
arxiv created 2007/10/10 · openalex publication_date 2007/10/22 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
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 clusters and the Hubble parameter versus redshift. The ΛCDM model with curvature and two parameterized dark energy models are studied. For the ΛCDM model, we find that the flat universe is consistent with observations at the 1σ 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, Ω m 0 , with Ω m 0 = 0.24, Ω m 0 = 0.28 and Ω m 0 = 0.32, our result seems to suggest that the trend of Ω m 0 dependence for an evolving dark energy from a combination of the observational datasets is model-dependent.