Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-04-02
Phys.Rev.D71:023506,2005
Astronomy and Astrophysics
Astrophysics
5 pages, 2 figures
Scientific paper
10.1103/PhysRevD.71.023506
Type Ia supernova data have recently become strong enough to enable, for the first time, constraints on the time variation of the dark energy density and its equation of state. Most analyses, however, are using simple two or three-parameter descriptions of the dark energy evolution, since it is well known that allowing more degrees of freedom introduces serious degeneracies. Here we present a method to produce uncorrelated and nearly model-independent band power estimates of the equation of state of dark energy and its density as a function of redshift. We apply the method to recently compiled supernova data. Our results are consistent with the cosmological constant scenario, in agreement with other analyses that use traditional parameterizations, though we find marginal (2-sigma) evidence for w(z) < -1 at z < 0.2. In addition to easy interpretation, uncorrelated, localized band powers allow intuitive and powerful testing of the constancy of either the energy density or equation of state. While we have used relatively coarse redshift binning suitable for the current set of about 150 supernovae, this approach should reach its full potential in the future, when applied to thousands of supernovae found from ground and space, combined with complementary information from other cosmological probes.
Cooray Asantha
Huterer Dragan
No associations
LandOfFree
Uncorrelated Estimates of Dark Energy Evolution does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Uncorrelated Estimates of Dark Energy Evolution, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Uncorrelated Estimates of Dark Energy Evolution will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-287057