Viability of Candidate Dark Energy Scenarios

Details Viability of Candidate Dark Energy Scenarios Viability of Candidate Dark Energy Scenarios

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21115201d&link_type=abstract

American Astronomical Society, AAS Meeting #211, #152.01; Bulletin of the American Astronomical Society, Vol. 39, p.1003

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Scientific paper

The explanation for the acceleration of the expansion of the universe remains elusive, although current cosmological data sets are consistent with a cosmological constant. Recently three major supernova collaborations, ESSENCE, SNLS and Higher-Z have all released major new data sets, and in Davis et al. (2007) the ESSENCE collaboration combined these new data with cosmic microwave background and baryon acoustic oscillation results. We assess whether the consistency with a cosmological constant is merely because the data are not yet good enough to constrain more complex models, or whether it is genuine evidence that more complex models are not necessary. This is done using model selection criteria.
Rather than testing only one parameterization of the equation of state of dark energy we test several specific non-standard cosmological models, which are motivated by differing fundamental physics. In this presentation we show that the Standard Chaplygin Gas and the DGP models are both strongly disfavored by current data. Although many of the remaining models are not ruled out by current data, model selection criteria show that their extra parameters appear to be unnecessary.
Funded by NSF grants AST-0443378 and AST-0507475.

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