Probing the cosmic acceleration history and the properties of dark energy from the ESSENCE supernova data with a model independent method

Abstract

With a model independent method the expansion history $H(z)$, the deceleration parameter $q(z)$ of the universe and the equation of state $w(z)$ for the dark energy are reconstructed directly from the 192 Sne Ia data points, which contain the new ESSENCE Sne Ia data and the high redshift Sne Ia data. We find that the evolving properties of $q(z)$ and $w(z)$ reconstructed from the 192 Sne Ia data seem to be weaker than that obtained from the Gold set, but stronger than that from the SNLS set. With a combination of the 192 Sne Ia and BAO data, a tight constraint on ${\Omega }_{m0}$ is obtained. At the $1\sigma$ confidence level ${\Omega }_{m0}=0.278_{-0.023}^{+0.024}$, which is highly consistent with that from the Gold+BAO and SNLS+BAO.

arXiv comment11 pages, 5 figures, to appear in JCAP

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• Reconstructing the Cosmic Expansion History up to Redshift z=6.29 with the Calibrated Gamma-Ray Bursts
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• Testing cosmic opacity from SNe Ia and Hubble parameter through three cosmological-model-independent methods
• Bright High z SnIa: A Challenge for LCDM?
• Scalar-tensor cosmologies with dust matter in the general relativity limit
• Revisiting dark energy models using differential ages of galaxies
• A new estimator of the deceleration parameter from galaxy rotation curves
• Remarks on (super-)accelerating cosmological models in general scalar-tensor gravity