Abstract / Description of output
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.
Original language | English |
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Pages (from-to) | 2806-2828 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 456 |
Issue number | 3 |
Early online date | 31 Dec 2015 |
DOIs | |
Publication status | Published - 1 Mar 2016 |
Keywords / Materials (for Non-textual outputs)
- surveys
- dark energy
- large-scale structure of Universe