Could Dark Energy be Measured from Redshift Surveys ?

Details Could Dark Energy be Measured from Redshift Surveys ? Could Dark Energy be Measured from Redshift Surveys ?

2002-12-16

arxiv.org/abs/astro-ph/0212358v1

Astronomy and Astrophysics

Astrophysics

Invited review at the XVIIIth IAP meeting `On the Nature of Dark Energy'; Paris 2002; 10 pages (2 figures included)

Scientific paper

We review the ability of redshift surveys to provide constraints on the Dark Energy content of the Universe. The matter power spectrum and dynamics at the present epoch are nearly `blind' to Dark Energy, but combined with the CMB they can provide a constraint on the Equation of State parameter w. A representative result from the 2dF galaxy redshift survey combined with the CMB is w <-0.52 (95 % CL; with a prior of w >= -1), consistent with Einstein's Cosmological Constant model (w=-1). More complicated forms of Quintessence (e.g. epoch-dependent w or w<-1) are not yet ruled out. At higher redshifts, the abundance of galaxies and clusters of galaxies, variants of the Alcock-Paczynski curvature test and cross correlation of the CMB with radio sources look potentially promising, but they suffer from degeneracy with other parameters such as the matter density and galaxy biasing.

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