Constraints on dark energy models from the Legacy and Gold SnIa datasets

Details Constraints on dark energy models from the Legacy and Gold SnIa datasets Constraints on dark energy models from the Legacy and Gold SnIa datasets

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jphcs..68a2056n&link_type=abstract

Journal of Physics: Conference Series, Volume 68, Issue 1, pp. 012056 (2007).

Physics

Scientific paper

A comparative analysis of three recent and reliable SnIa datasets available in the literature was made: the Full Gold (FG) dataset (157 data points 0 < z < 1.75), a Truncated Gold (TG) dataset (140 data points 0 < z < 1) and the most recent Supernova Legacy Survey (SNLS) dataset (115 data points 0 < z < 1). It was found that the best fit dynamical w(z) obtained from the SNLS dataset does not cross the PDL (w = -1) and remains above and close to the w = -1 line for the whole redshift range 0 < z < 1. In contrast, the best fit dynamical w(z) obtained from the Gold datasets (FG and TG) clearly crosses the PDL and departs significantly from the w = -1 line, while the LCDM parameter values are about 2 σ away from the best fit w(z), however not excluding it. Also for the Gold dataset a scalar-tensor theory was tested, for which the best fit form of w(z) was also found to cross the phantom divide line.

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