Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-05-30
Astrophys.J. 631 (2005) 1-20
Astronomy and Astrophysics
Astrophysics
ApJ, in press, 33 pages, 19 figures
Scientific paper
10.1086/432497
We use Monte Carlo techniques to simulate the ability of future large high-redshift galaxy surveys to measure the temporal evolution of the dark energy equation-of-state w(z), using the baryonic acoustic oscillations in the clustering power spectrum as a 'standard ruler'. Our analysis only utilizes the oscillatory component of the power spectrum and not its overall shape, which is potentially susceptible to broadband tilts induced by a host of model-dependent systematic effects. Our results are therefore robust and conservative. We show that baryon oscillation constraints can be thought of, to high accuracy, as a direct probe of the distance - redshift and expansion rate - redshift relations where distances are measured in units of the sound horizon. Distance precisions of 1% are obtainable for a fiducial redshift survey covering 10,000 deg^2 and redshift range 0.5 < z < 3.5. If the dark energy is further characterized by w(z) = w_0 + w_1 z (with a cut-off in the evolving term at z = 2), we can then measure the parameters w_0 and w_1 with a precision exceeding current knowledge by a factor of ten: 1 sigma accuracies Delta w_0 ~ 0.03 and Delta w_1 ~ 0.06 are obtainable (assuming a flat universe and that the other cosmological parameters Omega_m} and h could be measured independently to a precision of +/- 0.01 by combinations of future CMB and other experiments). We quantify how this performance degrades with redshift/areal coverage and knowledge of Omega_m and h, and discuss realistic observational prospects for such large-scale spectroscopic redshift surveys, with a variety of diverse techniques. We also quantify how large photometric redshift imaging surveys could be utilized to produce measurements of (w_0,w_1) with the baryonic oscillation method which may be competitive in the short term.
Blake Chris
Glazebrook Karl
No associations
LandOfFree
Measuring the cosmic evolution of dark energy with baryonic oscillations in the galaxy power spectrum 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 Measuring the cosmic evolution of dark energy with baryonic oscillations in the galaxy power spectrum, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Measuring the cosmic evolution of dark energy with baryonic oscillations in the galaxy power spectrum will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-455854