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arXiv 0909.3853astro-ph.CO
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宇宙尺度上偏离广义相对论的弱透镜探测

A weak lensing detection of a deviation from General Relativity on cosmic scales

Rachel Bean

摘要:

我们考虑的证据偏离广义相对论(GR)在大尺度结构的增长,使用两个参数,$γ$和$η$,量化的修改。我们考虑了WMAP宇宙微波背景数据中的综合萨克斯-沃尔夫效应(ISW)、2 MASS和SDSS巡天的ISW和星系分布之间的互相关、哈勃空间望远镜COSMOS巡天的弱透镜剪切场以及宇宙膨胀历史的测量结果。我们发现,目前的数据,驱动的COSMOS弱透镜测量,不利于GR在宇宙尺度上,更喜欢$η<1$在$1<z<2$在98%的显着性水平。

英文摘要:

We consider evidence for deviations from General Relativity (GR) in the growth of large scale structure, using two parameters, $γ$ and $η$, to quantify the modification. We consider the Integrated Sachs-Wolfe effect (ISW) in the WMAP Cosmic Microwave Background data, the cross-correlation between the ISW and galaxy distributions from 2MASS and SDSS surveys, and the weak lensing shear field from the Hubble Space Telescope's COSMOS survey along with measurements of the cosmic expansion history. We find current data, driven by the COSMOS weak lensing measurements, disfavors GR on cosmic scales, preferring $η<1$ at $1<z<2$ at the 98% significance level.

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