Scrutinizing Exotic Cosmological Models Using ESSENCE Supernova Data Combined with Other Cosmological Probes

Abstract

The first cosmological results from the ESSENCE supernova survey (Wood-Vasey et al. 2007) are extended to a wider range of cosmological models including dynamical dark energy and non-standard cosmological models. We fold in a greater number of external data sets such as the recent Higher-z release of high-redshift supernovae (Riess et al. 2007) as well as several complementary cosmological probes. Model comparison statistics such as the Bayesian and Akaike information criteria are applied to gauge the worth of models. These statistics favor models that give a good fit with fewer parameters. Based on this analysis, the preferred cosmological model is the flat cosmological constant model, where the expansion history of the universe can be adequately described with only one free parameter describing the energy content of the universe. Among the more exotic models that provide good fits to the data, we note a preference for models whose best-fit parameters reduce them to the cosmological constant model.

Accepted by ApJ. v2: Two figures added, minor typographical corrections. 10 pages, 9 figures

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• On Dark Energy and Dark Matter (Part II)
• Dark energy and negative compressibility of the Universe: A study based on cosmic equations of state
• Lookback time and Chandra constrains on cosmological parameters
• Cosmological solutions of Tensor-Vector theories of gravity with varying the space-time-matter coupling constant
• Dark Energy, with Signatures
• Propagation of gravitational waves in a universe with slowly-changing equation of state
• Phase space analysis of Rényi Holographic dark energy model
• A Universe without Dark Energy and Dark Matter
• Nonlinear matter terms in general scalar-tensor braneworld cosmology