On using the WMAP distance priors in constraining the time evolving equation of state of dark energy

Details On using the WMAP distance priors in constraining the time evolving equation of state of dark energy On using the WMAP distance priors in constraining the time evolving equation of state of dark energy

2008-05-08

arxiv.org/abs/0805.1118v2

Astrophys.J.683:L1-L4,2008

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, 2 tables

Scientific paper

10.1086/591082

Recently, the WMAP group has published their five-year data and considered the constraints on the time evolving equation of state of dark energy for the first time from the WMAP distance information. In this paper, we study the effectiveness of the usage of these distance information and find that these compressed CMB information can give similar constraints on dark energy parameters compared with the full CMB power spectrum if dark energy perturbations are included, however, once incorrectly neglecting the dark energy perturbations, the difference of the results are sizable.

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