Abstract

We investigate the behaviour of dark energy using the recentlyreleased supernova data of Riess et al 2004 and a modelindependent parametrization for dark energy (DE). We findthat, if no priors are imposed on Ω0m and h, DEwhich evolves with time provides a better fit to the SNe datathan ΛCDM. This is also true if we include results fromthe WMAP CMB data. From a joint analysis of SNe + CMB, thebest fit DE model has w0 ≲ −1 at the present epoch andthe transition from deceleration to acceleration occurs at zT = 0.39 ± 0.03. However, DE evolution becomes weaker if theΛCDM based CMB results Ω0m = 0.27 ± 0.04, h = 0.71 ± 0.06 are incorporated in the analysis. Inthis case, zT = 0.57 ± 0.07. Our results also show that theextent of DE evolution is sensitive to the manner in which thesupernova data is sampled.

Full Text
Paper version not known

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call