Supernovae constraints on models of dark energy revisited
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We use the Type Ia Supernova gold sample data of Riess {\it et al} in order to constrain three models of dark energy. We study the Cardassian model, the Dvali-Turner gravity modified model and the generalized Chaplygin gas model of dark energy - dark matter unification. In our best fit analysis for these three dark energy proposals we consider flat model and the non-flat model priors. We also discuss the degeneracy of the models with the XCDM model through the computation of the so-called jerk parameter.
Revtex4, 11 pages, 6 sets of figures, 3 tables. Version published at Physical Review D
Revtex4, 11 pages, 6 sets of figures, 3 tables. Version published at Physical Review D