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KiDS+2dFLenS+GAMA: testing the cosmological model with the EG statistic

Amon, A; Blake, C; Heymans, C; Joachimi, B; (2018) KiDS+2dFLenS+GAMA: testing the cosmological model with the EG statistic. Monthly Notices of the Royal Astronomical Society , 479 (3) pp. 3422-3437. 10.1093/mnras/sty1624. Green open access

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We present a new measurement of EG, which combines measurements of weak gravitational lensing, galaxy clustering, and redshift-space distortions. This statistic was proposed as a consistency test of General Relativity (GR) that is insensitive to linear, deterministic galaxy bias, and the matter clustering amplitude. We combine deep imaging data from KiDS with overlapping spectroscopy from 2dFLenS, BOSS DR12, and GAMA and find EG(z¯¯¯=0.267)=0.43±0.13 (GAMA), EG(z¯¯¯=0.305)=0.27±0.08 (LOWZ+2dFLOZ), and EG(z¯¯¯=0.554)=0.26±0.07 (CMASS+2dFHIZ). We demonstrate that the existing tension in the value of the matter density parameter hinders the robustness of this statistic as solely a test of GR. We find that our EG measurements, as well as existing ones in the literature, favour a lower matter density cosmology than the cosmic microwave background. For a flat ΛCDM Universe, we find Ωm(z = 0) = 0.25 ± 0.03. With this paper, we publicly release the 2dFLenS data set at: http://2dflens.swin.edu.au.

Type: Article
Title: KiDS+2dFLenS+GAMA: testing the cosmological model with the EG statistic
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/mnras/sty1624
Publisher version: http://dx.doi.org/10.1093/mnras/sty1624
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: gravitational lensing: weak, surveys, cosmology: observations, large-scale structure of Universe
URI: http://discovery.ucl.ac.uk/id/eprint/10055918
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