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

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posted on 2023-06-09, 15:53 authored by A Amon, C Blake, C Heymans, C D Leonard, M Asgari, M Bilicki, A Choi, T Erben, K Glazebrook, J Harnois-Déraps, H Hildebrandt, H Hoekstra, B Joachimi, S Joudaki, K Kuijken, C Lidman, Jonathan LovedayJonathan Loveday, D Parkinson, E A Valentijn, C Wolf
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 CDM Universe, we find m(z = 0) = 0.25 ± 0.03. With this paper, we publicly release the 2dFLenS data set at: http://2dflens.swin.edu.au.

History

Publication status

  • Published

File Version

  • Published version

Journal

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

Publisher

Oxford University Press

Issue

3

Volume

479

Page range

3422-3437

Department affiliated with

  • Physics and Astronomy Publications

Research groups affiliated with

  • Astronomy Centre Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2018-11-19

First Open Access (FOA) Date

2018-11-19

First Compliant Deposit (FCD) Date

2018-11-12

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