Testing gravity using large-scale redshift-space distortions

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dc.contributor.authorRaccanelli, Alvise
dc.contributor.authorBertacca, Daniele
dc.contributor.authorPietrobon, Davide
dc.contributor.authorSchmidt, Fabian
dc.contributor.authorSamushia, Lado
dc.contributor.authorBartolo, Nicola
dc.contributor.authorDoré, Olivier
dc.contributor.authorMatarrese, Sabino
dc.contributor.authorPercival, Will J.
dc.date.accessioned2017-07-25T09:11:57Z
dc.date.available2017-07-25T09:11:57Z
dc.date.issued2013
dc.description.abstractWe use luminous red galaxies from the Sloan Digital Sky Survey (SDSS) II to test the cosmological structure growth in two alternatives to the standard cold dark matter ( CDM)+general relativity (GR) cosmological model. We compare observed threedimensional clustering in SDSS Data Release 7 (DR7) with theoretical predictions for the standard vanilla CDM+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 rmax = 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 rc ≥ 340 Mpc, at 95 per cent confidence level.en_US
dc.description.accreditationDepartment of HE and Training approved list
dc.identifier.citationRaccanelli, A. et al. (2013). Testing gravity using large-scale redshift-space distortions. Monthly Notices of the Royal Astronomical Society, 436: 89–100en_US
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/10566/3104
dc.language.isoenen_US
dc.publisherOxford University Pressen_US
dc.rightsPublisher retains copyright. Authors may archive the published version in their institutional repository.
dc.source.urihttp://dx.doi.org/10.1093/mnras/stt1517
dc.subjectMethodsen_US
dc.subjectAnalytical – cosmologicalen_US
dc.subjectParameters – cosmologyen_US
dc.subjectObservationsen_US
dc.subjectLarge-scale structure of Universeen_US
dc.titleTesting gravity using large-scale redshift-space distortionsen_US
dc.typeArticleen_US

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