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RCSLenS: testing gravitational physics through the cross-correlation of weak lensing and large-scale structure

Blake, C, Joudaki, S, Heymans, C, Choi, A, Erben, T, Harnois-Déraps, J, Hildebrandt, H, Joachimi, B, Nakajima, R, van Waerbeke, L and Viola, M (2015) RCSLenS: testing gravitational physics through the cross-correlation of weak lensing and large-scale structure. Monthly Notices of the Royal Astronomical Society, 456 (3). pp. 2806-2828. ISSN 0035-8711

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Abstract

The unknown nature of ‘dark energy’ motivates continued cosmological tests of large-scale gravitational physics. We present a new consistency check based on the relative amplitude of non-relativistic galaxy peculiar motions, measured via redshift-space distortion, and the relativistic deflection of light by those same galaxies traced by galaxy–galaxy lensing. We take advantage of the latest generation of deep, overlapping imaging and spectroscopic data sets, combining the Red Cluster Sequence Lensing Survey, the Canada–France–Hawaii Telescope Lensing Survey, the WiggleZ Dark Energy Survey and the Baryon Oscillation Spectroscopic Survey. We quantify the results using the ‘gravitational slip’ statistic EG, which we estimate as 0.48 ± 0.10 at z = 0.32 and 0.30 ± 0.07 at z = 0.57, the latter constituting the highest redshift at which this quantity has been determined. These measurements are consistent with the predictions of General Relativity, for a perturbed Friedmann–Robertson–Walker metric in a Universe dominated by a cosmological constant, which are EG = 0.41 and 0.36 at these respective redshifts. The combination of redshift-space distortion and gravitational lensing data from current and future galaxy surveys will offer increasingly stringent tests of fundamental cosmology.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical and Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press (OUP)
Date Deposited: 24 Jul 2020 10:05
Last Modified: 24 Jul 2020 10:15
DOI or Identification number: 10.1093/mnras/stv2875
URI: https://researchonline.ljmu.ac.uk/id/eprint/13362

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