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

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...

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Veröffentlicht in:Monthly notices of the Royal Astronomical Society 2016-03, Vol.456 (3), p.2806-2828
Hauptverfasser: Blake, Chris, Joudaki, Shahab, Heymans, Catherine, Choi, Ami, Erben, Thomas, Harnois-Deraps, Joachim, Hildebrandt, Hendrik, Joachimi, Benjamin, Nakajima, Reiko, van Waerbeke, Ludovic, Viola, Massimo
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container_issue 3
container_start_page 2806
container_title Monthly notices of the Royal Astronomical Society
container_volume 456
creator Blake, Chris
Joudaki, Shahab
Heymans, Catherine
Choi, Ami
Erben, Thomas
Harnois-Deraps, Joachim
Hildebrandt, Hendrik
Joachimi, Benjamin
Nakajima, Reiko
van Waerbeke, Ludovic
Viola, Massimo
description 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 E G, 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 E G = 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.
doi_str_mv 10.1093/mnras/stv2875
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subjects Astronomy
Dark energy
Deflection
Distortion
Galaxies
Gravitation
Gravity
Red shift
Sky surveys (astronomy)
Stars & galaxies
Statistics
title RCSLenS: testing gravitational physics through the cross-correlation of weak lensing and large-scale structure
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