KiDS+2dFLenS+GAMA: testing the cosmological model with the EG statistic
KiDS+2dFLenS+GAMA: testing the cosmological model with the EG statistic
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DOI：
10.1093/mnras/sty1624
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发表时间：
2017-11
影响因子：
4.8
通讯作者：
A. Amon;C. Blake;C. Heymans;C. D. Leonard;M. Asgari;Maciej Bilicki;A. Choi;T. Erben;K. Glazebrook;J. Harnois-Déraps;H. Hildebrandt;H. Hoekstra;B. Joachimi;S. Joudaki;K. Kuijken;C. Lidman;J. Loveday;D. Parkinson;E. Valentijn;C. Wolf
中科院分区：
文献类型：
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作者：
A. Amon;C. Blake;C. Heymans;C. D. Leonard;M. Asgari;Maciej Bilicki;A. Choi;T. Erben;K. Glazebrook;J. Harnois-Déraps;H. Hildebrandt;H. Hoekstra;B. Joachimi;S. Joudaki;K. Kuijken;C. Lidman;J. Loveday;D. Parkinson;E. Valentijn;C. Wolf
我们提出了一种新的测量EG的方法，它结合了弱引力透镜、星系群集和红移空间畸变的测量。该统计量被提出作为广义相对论（GR）的一致性检验，广义相对论对线性、确定性星系偏差和物质聚类振幅不敏感。我们将KiDS的深度成像数据与2dFLenS、BOSS DR12和GAMA的重叠光谱相结合，得到EG(z = 0.267) = 0.43±0.13 （GAMA）、EG(z = 0.305) = 0.27±0.08 （LOWZ+2dFLOZ）和EG(z = 0.554) = 0.26±0.07 （CMASS+2dFHIZ）。我们证明，物质密度参数值的现有张力阻碍了该统计数据的鲁棒性，仅作为GR的测试。我们发现，我们的EG测量以及文献中的现有测量都倾向于比宇宙微波背景更低的物质密度宇宙学。对于平坦的CDM宇宙，我们发现m(z = 0) = 0.25±0.03。通过本文，我们在：http://2dflens.swin.edu.au上公开发布了2dFLenS数据集。
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.