Ujjaini Alam et al JCAP06(2004)008 doi:10.1088/1475-7516/2004/06/008
The case for dynamical dark energy revisited
Ujjaini Alam1, Varun Sahni1 and A A Starobinsky2
Show affiliations We investigate the behaviour of dark energy using the recently released supernova data of Riess et al 2004 and a model independent parametrization for dark energy (DE). We find that, if no priors are imposed on Ω0m and h, DE which evolves with time provides a better fit to the SNe data than ΛCDM. This is also true if we include results from the WMAP CMB data. From a joint analysis of SNe + CMB, the best fit DE model has w0 
−1 at the present epoch and the transition from deceleration to acceleration occurs at zT = 0.39 ± 0.03. However, DE evolution becomes weaker if the ΛCDM based CMB results Ω0m = 0.27 ± 0.04, h = 0.71 ± 0.06 are incorporated in the analysis. In this case, zT = 0.57 ± 0.07. Our results also show that the extent of DE evolution is sensitive to the manner in which the supernova data is sampled.
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Issue 06 (June 2004)
Received 8 April 2004, accepted for publication 27 May 2004
Published 16 June 2004
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The case for dynamical dark energy revisited
Ujjaini Alam et al JCAP06(2004)008
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