广义相对论
物理
暗物质
宇宙学
弱引力透镜
万有引力
引力透镜
引力透镜形式主义
银河系
暗能量
天体物理学
广义相对论检验
理论物理学
经典力学
引力红移
红移
作者
Reinabelle Reyes,Rachel Mandelbaum,Uroš Seljak,Tobias Baldauf,James E. Gunn,Lucas Lombriser,R. C. Smith
出处
期刊:Nature
[Springer Nature]
日期:2010-03-01
卷期号:464 (7286): 256-258
被引量:305
摘要
Although general relativity underlies modern cosmology, its applicability on cosmological length scales has yet to be stringently tested. Such a test has recently been proposed, using a quantity, E(G), that combines measures of large-scale gravitational lensing, galaxy clustering and structure growth rate. The combination is insensitive to 'galaxy bias' (the difference between the clustering of visible galaxies and invisible dark matter) and is thus robust to the uncertainty in this parameter. Modified theories of gravity generally predict values of E(G) different from the general relativistic prediction because, in these theories, the 'gravitational slip' (the difference between the two potentials that describe perturbations in the gravitational metric) is non-zero, which leads to changes in the growth of structure and the strength of the gravitational lensing effect. Here we report that E(G) = 0.39 +/- 0.06 on length scales of tens of megaparsecs, in agreement with the general relativistic prediction of E(G) approximately 0.4. The measured value excludes a model within the tensor-vector-scalar gravity theory, which modifies both Newtonian and Einstein gravity. However, the relatively large uncertainty still permits models within f(R) theory, which is an extension of general relativity. A fivefold decrease in uncertainty is needed to rule out these models.
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