Present and future evidence for evolving dark energy

Details Present and future evidence for evolving dark energy Present and future evidence for evolving dark energy

2006-10-04

arxiv.org/abs/astro-ph/0610126v2

Phys.Rev.D74:123506,2006

Astronomy and Astrophysics

Astrophysics

10 pages RevTex4, 3 figures included. Minor changes to match version accepted by PRD

Scientific paper

10.1103/PhysRevD.74.123506

We compute the Bayesian evidences for one- and two-parameter models of evolving dark energy, and compare them to the evidence for a cosmological constant, using current data from Type Ia supernova, baryon acoustic oscillations, and the cosmic microwave background. We use only distance information, ignoring dark energy perturbations. We find that, under various priors on the dark energy parameters, LambdaCDM is currently favoured as compared to the dark energy models. We consider the parameter constraints that arise under Bayesian model averaging, and discuss the implication of our results for future dark energy projects seeking to detect dark energy evolution. The model selection approach complements and extends the figure-of-merit approach of the Dark Energy Task Force in assessing future experiments, and suggests a significantly-modified interpretation of that statistic.

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