Journal Article

Testing standard cosmology with large-scale structure*

Arthur Stril, Robert N. Cahn and Eric V. Linder

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 404, issue 1, pages 239-246
Published in print May 2010 | ISSN: 0035-8711
Published online April 2010 | e-ISSN: 1365-2966 | DOI: https://dx.doi.org/10.1111/j.1365-2966.2010.16193.x
Testing standard cosmology with large-scale structure*

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The galaxy power spectrum contains information on the growth of structure, the growth rate through redshift space distortions and the cosmic expansion through baryon acoustic oscillation features. We study the ability of two proposed experiments, BigBOSS and JDEM-PS, to test the cosmological model and general relativity. We quantify the latter result in terms of the gravitational growth index γ, whose value in general relativity is γ≈ 0.55. Significant deviations from this value could indicate new physics beyond the standard model of cosmology. The results show that BigBOSS (JDEM-PS) would be capable of measuring γ with an uncertainty σ(γ) = 0.043 (0.054), which tightens to σ(γ) = 0.031 (0.038) if we include Stage III data priors, marginalizing over neutrino mass, time-varying dark energy equation of state, and other parameters. For all dark energy parameters and related figures of merit, the two experiments give comparable results. We also carry out some studies of the influence of redshift range, resolution, treatment of non-linearities and bias evolution to enable further improvement.

Keywords: cosmological parameters; cosmology: observations; large-scale structure of Universe

Journal Article.  5946 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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