Probing the cosmic acceleration history and the properties of dark energy from the ESSENCE supernova data with a model independent method
Journal of Cosmology and Astroparticle Physics
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
... ation of the 192 Sne Ia and BAO data, a tight constraint on Ω_m0 is obtained. At the 1σ confidence level Ω_m0=0.278^+0.024_-0.023, which is highly consistent with that from the Gold+BAO and SNLS+BAO.