Constraining dark energy interacting models with WMAP

Details Constraining dark energy interacting models with WMAP Constraining dark energy interacting models with WMAP

2005-11-16

arxiv.org/abs/astro-ph/0511474v1

AIP Conf.Proc.841:550-553,2006

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures. Uses AIP style. To be published in the AIP Proceedings of the XXVIII Spanish Relativity Meeting

Scientific paper

10.1063/1.2218234

We determine the range of parameter space of an interacting quintessence (IQ) model that best fits the luminosity distance of type Ia supernovae data and the recent WMAP measurements of Cosmic Microwave Background temperature anisotropies. Models in which quintessence decays into dark matter provide a clean explanation for the coincidence problem. We focus on cosmological models of zero spatial curvature. We show that if the dark energy (DE) decays into cold dark matter (CDM) at a rate that brings the ratio of matter to dark energy constant at late times, the supernovae data are not sufficient to constrain the interaction parameter. On the contrary, WMAP data constrain it to be smaller than $c^2 < 10^{-2}$ at the $3\sigma$ level. Accurate measurements of the Hubble constant and the dark energy density, independent of the CMB data, would support/disprove this set of models.

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