Model independent analysis of dark energy I: Supernova fitting result

Details Model independent analysis of dark energy I: Supernova fitting result Model independent analysis of dark energy I: Supernova fitting result

2004-05-24

arxiv.org/abs/astro-ph/0405446v5

Class.Quant.Grav.22:2121-2133,2005

Astronomy and Astrophysics

Astrophysics

v4: minor corrections, main results unchanged. 10 figures, use revtex, 7 pages, v5: refences updated, will appear in Class. Qu

Scientific paper

10.1088/0264-9381/22/11/014

The nature of dark energy is a mystery to us. This paper uses the supernova data to explore the property of dark energy by some model independent methods. We first Talyor expanded the scale factor $a(t)$ to find out the deceleration parameter $q_0<0$. This result just invokes the Robertson-Walker metric. Then we discuss several different parameterizations used in the literature. We find that $\Omega_{\rm DE0}$ is almost less than -1 at $1\sigma$ level. We also find that the transition redshift from deceleration phase to acceleration phase is $z_{\rm T}\sim 0.3$.

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