Constraining Dark Energy with X-ray Galaxy Clusters, Supernovae and the Cosmic Microwave Background

Details Constraining Dark Energy with X-ray Galaxy Clusters, Supernovae and the Cosmic Microwave Background Constraining Dark Energy with X-ray Galaxy Clusters, Supernovae and the Cosmic Microwave Background

2004-09-24

arxiv.org/abs/astro-ph/0409574v2

Mon.Not.Roy.Astron.Soc.360:555-564,2005

Astronomy and Astrophysics

Astrophysics

11 pages, 13 figures, 2 tables. Accepted for publication in MNRAS. Two new figures added: Fig.9 shows the effects of including

Scientific paper

10.1111/j.1365-2966.2005.09067.x

We present new constraints on the evolution of dark energy from an analysis of Cosmic Microwave Background, supernova and X-ray galaxy cluster data. Our analysis employs a minimum of priors and exploits the complementary nature of these data sets. We examine a series of dark energy models with up to three free parameters: the current dark energy equation of state w_0, the early time equation of state w_et and the scale factor at transition, a_t. From a combined analysis of all three data sets, assuming a constant equation of state and that the Universe is flat, we measure w_0=-1.05+0.10-0.12. Including w_et as a free parameter and allowing a_t to vary over the range 0.5

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