Testing nonstandard cosmological models with SNLS3 supernova data and other cosmological probes

Abstract

We investigate the implications for some nonstandard cosmological models using data from the first three years of the Supernova Legacy Survey (SNLS3), assuming a spatially flat universe. A comparison between the constraints from the SNLS3 and those from other SN Ia samples, such as the ESSENCE, Union2, SDSS-II and Constitution samples, is given and the effects of different light-curve fitters are considered. We find that SN Ia with SALT2 or SALT or SIFTO can give consistent results and the tensions between different data sets and different light-curve fitters are obvious for fewer-free-parameters models. At the same time, we also study the constraints from the SNLS3 along with data from the cosmic microwave background and the baryonic acoustic oscillations (CMB/BAO), and the latest Hubble parameter versus redshift (H(z)). Using model selection criteria such as ${\chi }^2$/dof, GoF, AIC and BIC, we find that, among all the cosmological models considered here ($\Lambda$CDM, constant $w$, varying $w$, DGP, modified polytropic Cardassian, and the generalized Chaplygin gas), the flat DGP is favored by the SNLS3 alone. However, when additional CMB/BAO or H(z) constraints are included, this is no longer the case, and the flat $\Lambda$CDM becomes preferred.

24 pages, 12 figures and 4 tables, version to be published in ApJ

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• Observational Constraints on Modified Chaplygin Gas from Cosmic Growth
• Probing modified gravity theories with multiple measurements of high-redshift quasars
• Observational constraints on cosmic neutrinos and dark energy revisited
• Narrowing down the possible explanations of cosmic acceleration with geometric probes
• Testing modified gravity models with recent cosmological observations
• A magnified glance into the dark sector: probing cosmological models with strong lensing in A1689
• Model-independent Estimations for the Cosmic Curvature from the Latest Strong Gravitational Lensing Systems
• Probing modified gravity theories with the Sandage-Loeb test
• GCG Parametrization for Growth Function and Current Constraints
• Unbiased constraints on the clumpiness of universe from standard candles
• Revisiting Cardassian Model and Cosmic Constraint
• Testing and selecting cosmological models with ultra-compact radio quasars
• The Cosmological Effect of CMB/BAO Measurements