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Testing gravity using large-scale redshift-space distortions

Raccanelli, Alvise and Bertacca, Daniele and Pietrobon, Davide and Schmidt, Fabian and Samushia, Lado and Bartolo, Nicola and Doré, Olivier and Matarrese, Sabine and Percival, Will J. (2013) Testing gravity using large-scale redshift-space distortions. Monthly Notices of the Royal Astronomical Society, 436 (1). pp. 89-100. ISSN 0035-8711.

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We use luminous red galaxies from the Sloan Digital Sky Survey (SDSS) II to test the cosmological structure growth in two alternatives to the standard Λ cold dark matter (ΛCDM)+general relativity (GR) cosmological model. We compare observed three-dimensional clustering in SDSS Data Release 7 (DR7) with theoretical predictions for the standard vanilla ΛCDM+GR model, unified dark matter (UDM) cosmologies and the normal branch Dvali–Gabadadze–Porrati (nDGP). In computing the expected correlations in UDM cosmologies, we derive a parametrized formula for the growth factor in these models. For our analysis we apply the methodology tested in Raccanelli et al. and use the measurements of Samushia et al. that account for survey geometry, non-linear and wide-angle effects and the distribution of pair orientation. We show that the estimate of the growth rate is potentially degenerate with wide-angle effects, meaning that extremely accurate measurements of the growth rate on large scales will need to take such effects into account. We use measurements of the zeroth and second-order moments of the correlation function from SDSS DR7 data and the Large Suite of Dark Matter Simulations (LasDamas), and perform a likelihood analysis to constrain the parameters of the models. Using information on the clustering up to r_(max) = 120 h^(−1) Mpc, and after marginalizing over the bias, we find, for UDM models, a speed of sound c_∞ ≤ 6.1e-4, and, for the nDGP model, a cross-over scale r_c ≥ 340 Mpc, at 95 per cent confidence level.

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URLURL TypeDescription Paper
Doré, Olivier0000-0002-5009-7563
Additional Information:© 2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2013 August 11. Received 2013 August 11; in original form 2012 July 13. First published online: September 25, 2013. Part of the research described in this paper was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. AR would like to thank for the hospitality the Institute of Cosmology and Gravitation at the University of Portsmouth, where part of this work was carried out. FS is supported by the Gordon and Betty Moore Foundation at Caltech. WJP is grateful for support from the European Research Council and STFC. LS acknowledges support from European Research Council, Georgian National Science Foundation grant ST08/4-442 and SNSF (SCOPES grant No. 128040).
Funding AgencyGrant Number
Gordon and Betty Moore FoundationUNSPECIFIED
European Research Council (ERC)UNSPECIFIED
Science and Technology Facilities Council (STFC)UNSPECIFIED
National Science Foundation (Georgia)ST08/4-442
Swiss National Science Foundation (SNSF)128040
Subject Keywords:methods: analytical, cosmological parameters, cosmology: observations, large-scale structure of Universe
Issue or Number:1
Record Number:CaltechAUTHORS:20131209-152055422
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Official Citation:Alvise Raccanelli, Daniele Bertacca, Davide Pietrobon, Fabian Schmidt, Lado Samushia, Nicola Bartolo, Olivier Doré, Sabino Matarrese, and Will J. Percival Testing gravity using large-scale redshift-space distortions MNRAS (November 21, 2013) Vol. 436 89-100 first published online September 25, 2013 doi:10.1093/mnras/stt1517
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42912
Deposited By: Ruth Sustaita
Deposited On:10 Dec 2013 15:57
Last Modified:03 Oct 2019 06:03

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