Bayesian Evidence for a cosmological constant using new high-redshift supernova data

Paolo Serra, Alan Heavens, Alessandro Melchiorri

Research output: Contribution to journalArticlepeer-review

Abstract

We carry out a Bayesian model selection analysis of different dark energy parametrization s using the recent luminosity distance data of high-redshift supernovae from Riess et al. and from the new ESSENCE Supernova Survey. Including complementary cosmological data sets, we found substantial Evidence [Delta ln (E) similar to 1] against a time-varying dark energy equation-of-state parameter, and against phantom dark energy models. We find a small preference for a standard cosmological constant over accelerating non-phantom models where w is constant, but allowed to vary in the range - 1 to -0.33.

Original languageEnglish
Pages (from-to)169-175
Number of pages7
JournalMonthly Notices of the Royal Astronomical Society
Volume379
Issue number1
DOIs
Publication statusPublished - 21 Jul 2007

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