Constraints on a variable dark energy model with recent observations

Details Constraints on a variable dark energy model with recent observations Constraints on a variable dark energy model with recent observations

2006-11-16

arxiv.org/abs/astro-ph/0611507v2

Phys.Lett.B643:315-318,2006

Astronomy and Astrophysics

Astrophysics

10 pages, 4 figures, references added

Scientific paper

10.1016/j.physletb.2006.11.021

We place, by the maximum likelihood method, constraints on a variable dark energy model with the equation of state $w=w_0/[1+b\ln (1+z)]^2$ 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 $w_0$ around -1, in contrast to the Gold data set which favors a more negative $w_0$. By combining these three databases, we obtain that $\Omega_m=0.27_{-0.038}^{+0.036}$, $w_0=-1.11_{-0.30}^{+0.21}$ and $b=0.31^{+ 0.71}_{-0.31}$ with $\chi^2=110.4$ 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.

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