2006/11/21 by Puxun Wu, Hongwei Yu · 1 citation
Chemistry · Mathematics · Physics and Astronomy · #Astrophysics #Baryon #Black Holes and Theoretical Physics #Chemistry #Cosmic microwave background #Cosmology #Cosmology and Gravitation Theories #Dark energy #Energy (signal processing) #Equation of state #Mathematical analysis #Mathematics #Oscillation (cell signaling) #Physics #Quantum mechanics #Solar and Space Plasma Dynamics #Variable (mathematics) #astro-ph #gr-qc
paper · pdf · doi:10.1016/j.physletb.2006.11.021
published as Phys.Lett.B643:315-318,2006 · 10 pages, 4 figures, references added
arxiv created 2006/11/21 · openalex publication_date 2006/11/28 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We place, by the maximum likelihood method, constraints on a variable dark energy model with the equation of state w=w0/[1+bln (1+z)]2 using some recent observational data, including the new Sne Ia data from the SNLS, the size of baryonic acoustic oscillation peak from SDSS and the CMB data from WMAP3. We find that the SNLS data favor models with w0 around -1, in contrast to the Gold data set which favors a more negative w0. By combining these three databases, we obtain that Ωm=0.27-0.038+0.036, w0=-1.11-0.30+0.21 and b=0.31+ 0.71-0.31 with χ2=110.4 at the 95% confidence level. Our result suggests that a varying dark energy model and a crossing of the w = -1 line are favored, and the present value of the equation of state of dark energy is very likely less than -1.