Principal component analysis of modified gravity using weak lensing and peculiar velocity measurements
Principal component analysis of modified gravity using weak lensing and peculiar velocity measurements
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DOI：
10.1088/1475-7516/2013/08/029
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发表时间：
2013-06
影响因子：
6.4
通讯作者：
S. Asaba;C. Hikage;K. Koyama;Gong-Bo Zhao;A. Hojjati;L. Pogosian
中科院分区：
文献类型：
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作者：
S. Asaba;C. Hikage;K. Koyama;Gong-Bo Zhao;A. Hojjati;L. Pogosian
我们进行了主成分分析，以评估未来的观测能力，以衡量偏离广义相对论的预测的泊松和各向异性方程的线性尺度。特别是，我们专注于如何测量红移空间失真（RSD）观测光谱星系红移调查时，结合透镜层析调查将提高约束。假设一个欧几里德星系成像和红移调查，我们发现，增加3D信息减少了统计不确定性的3和7之间的一个因素的情况下，只有从透镜层析成像调查的观测值被使用。我们还发现，良好的约束模式的数量增加了3和6之间的一个因素。我们的研究表明，联合星系成像和红移调查，如SuMIRe和欧几里得的重要性，以提供更严格的测试的ΛCDM模型，并区分各种修改的重力和暗能量模型。
We perform a principal component analysis to assess ability of future observations to measure departures from General Relativity in predictions of the Poisson and anisotropy equations on linear scales. In particular, we focus on how the measurements of redshift-space distortions (RSD) observed from spectroscopic galaxy redshift surveys will improve the constraints when combined with lensing tomographic surveys. Assuming a Euclid-like galaxy imaging and redshift survey, we find that adding the 3D information decreases the statistical uncertainty by a factor between 3 and 7 compared to the case when only observables from lensing tomographic surveys are used. We also find that the number of well-constrained modes increases by a factor between 3 and 6. Our study indicates the importance of joint galaxy imaging and redshift surveys such as SuMIRe and Euclid to give more stringent tests of the ΛCDM model and to distinguish between various modified gravity and dark energy models.