Testing gravity on large scales by combining weak lensing with galaxy clustering using CFHTLenS and BOSS CMASS
Testing gravity on large scales by combining weak lensing with galaxy clustering using CFHTLenS and BOSS CMASS
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DOI：
10.1093/mnras/stw3056
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发表时间：
2016-10
影响因子：
4.8
通讯作者：
S. Alam;H. Miyatake;S. More;S. Ho;R. Mandelbaum
中科院分区：
文献类型：
--
作者：
S. Alam;H. Miyatake;S. More;S. Ho;R. Mandelbaum
我们测量的引力透镜，星系集群，和红移空间扭曲称为$E_G$的组合。量E_G探测度量势的两个部分，并且对星系偏差和\sigma_8\$不敏感。这些性质使它成为一个有吸引力的统计测试$\Lambda$CDM，广义相对论及其替代理论。我们结合CMASS DR 11和CFHTLenS以及最近的RSD分析中的$\beta$的测量，发现$E_G（z = 0.57）= 0.42 \pm 0.056$，与使用普朗克2015宇宙学参数的广义相对论$E_G（z = 0.57）= 0.396 \pm 0.011$的预测一致13\%。我们已经为各种观测和理论系统学修正了我们的测量。我们的测量结果与第一次用CMB透镜代替星系透镜测量E_G的结果是一致的。2015 a），但与包括大尺度在内的最终结果相比，显示出2.8sigma $张力。这种分析与未来的调查将提供改进的统计误差和更好的控制系统，以测试广义相对论及其替代理论。
We measure a combination of gravitational lensing, galaxy clustering, and redshift-space distortions called $E_G$. The quantity $E_G$ probes both parts of metric potential and is insensitive to galaxy bias and $\sigma_8$. These properties make it an attractive statistic to test $\Lambda$CDM, General Relativity and its alternate theories. We have combined CMASS DR11 with CFHTLenS and recent measurements of $\beta$ from RSD analysis, and find $E_G(z = 0.57) = 0.42 \pm 0.056$, an 13\% measurement in agreement with the prediction of general relativity $E_G(z = 0.57) = 0.396 \pm 0.011$ using the Planck 2015 cosmological parameters. We have corrected our measurement for various observational and theoretical systematics. Our measurement is consistent with the first measurement of $E_G$ using CMB lensing in place of galaxy lensing (Pullen et. al. 2015a) at small scales, but shows 2.8$\sigma$ tension when compared with their final results including large scales. This analysis with future surveys will provide improved statistical error and better control over systematics to test General Relativity and its alternate theories.