Isocurvature modes and Baryon Acoustic Oscillations

Details Isocurvature modes and Baryon Acoustic Oscillations Isocurvature modes and Baryon Acoustic Oscillations

2010-06-18

arxiv.org/abs/1006.3806v1

JCAP10(2010)009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

23 pages, 3 figures

Scientific paper

10.1088/1475-7516/2010/10/009

The measurement of Baryonic Acoustic Oscillations from galaxy surveys is well known to be a robust and powerful tool to constrain dark energy. This method relies on the knowledge of the size of the acoustic horizon at radiation drag derived from Cosmic Microwave Background Anisotropy measurements. In this paper we quantify the effect of non-standard initial conditions in the form of an isocurvature component on the determination of dark energy parameters from future BAO surveys. In particular, if there is an isocurvature component (at a level still allowed by present data) but it is ignored in the CMB analysis, the sound horizon and cosmological parameters determination is biased, and, as a consequence, future surveys may incorrectly suggest deviations from a cosmological constant. In order to recover an unbiased determination of the sound horizon and dark energy parameters, a component of isocurvature perturbations must be included in the model when analyzing CMB data. Fortunately, doing so does not increase parameter errors significantly.

Affiliated with

Also associated with

No associations

Rating

Isocurvature modes and Baryon Acoustic Oscillations 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 Isocurvature modes and Baryon Acoustic Oscillations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Isocurvature modes and Baryon Acoustic Oscillations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-431171