Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 400, Issue 3, Pages 1643-1664Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2009.15572.x
Keywords
cosmological parameters; large-scale structure of Universe
Categories
Funding
- Spanish Ministerio de Ciencia y Tecnologia (MEC) [AYA2006-06341]
- Consolider-Ingenio [CSD2007-00060]
- Generalitat de Catalunya and the Juan de la Cierva MEC programme [2005SGR00728]
- NASA
- STFC
- STFC [ST/F002300/1, ST/H008519/1, ST/F002289/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/H008519/1, ST/F002289/1, ST/F002300/1] Funding Source: researchfish
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We apply a new model for the spherically averaged correlation function at large pair separations to the measurement of the clustering of luminous red galaxies (LRGs) made from the Sloan Digital Sky Survey by Cabre & Gaztanaga. Our model takes into account the form of the baryonic acoustic oscillation peak and the large-scale shape of the correlation function. We perform a Monte Carlo Markov chain analysis for different combinations of data sets and for different parameter sets. When used in combination with a compilation of the latest cosmic microwave background (CMB) measurements, the LRG clustering and the latest supernovae results give constraints on cosmological parameters which are comparable and in remarkably good agreement, resolving the tension reported in some studies. The best-fitting model in the context of a flat, Lambda cold dark matter cosmology is specified by (m) = 0.261 +/- 0.013, (b) = 0.044 +/- 0.001, n(s) = 0.96 +/- 0.01, H-0 = 71.6 +/- 1.2 km s-1 Mpc-1 and Sigma(8) = 0.80 +/- 0.02. If we allow the time-independent dark energy equation of state parameter to vary, we find results consistent with a cosmological constant at the 5 per cent level using all data sets: w(DE) = -0.97 +/- 0.05. The large-scale structure measurements by themselves can constrain the dark energy equation-of-state parameter to w(DE) = -1.05+0.16(-0.15), independently of CMB or supernovae data. We do not find convincing evidence for an evolving equation of state. We provide a set of 'extended distance priors' that contain the most relevant information from the CMB power spectrum and the shape of the LRG correlation function which can be used to constrain dark energy models and spatial curvature. Our model should provide an accurate description of the clustering even in much larger, forthcoming surveys, such as those planned with NASA's JDEM or ESA's Euclid mission.
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