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arXiv 1012.5854astro-ph.CO
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修正引力的COSMOS弱透镜约束

COSMOS weak-lensing constraints on modified gravity

Ismael Tereno, Elisabetta Semboloni, Tim Schrabback

摘要:

观测到的宇宙加速,可以通过暗能量来解释,也可以通过引力的修正来解释,引力的修正也会引起宇宙学扰动演化的修正。我们使用来自COSMOS巡天的新的弱透镜数据来检验与广义相对论的偏差。从GR的偏离参数化的模型无关的方式,一贯参数化的两点宇宙剪切振幅和增长。使用CMB先验,我们进行了可能性分析。我们发现信号的振幅上的约束并不表示偏离广义相对论。

英文摘要:

The observed acceleration of the universe, explained through dark energy, could alternatively be explained through a modification of gravity that would also induce modifications in the evolution of cosmological perturbations. We use new weak lensing data from the COSMOS survey to test for deviations from General Relativity. The departure from GR is parametrized in a model-independent way that consistently parametrizes the two-point cosmic shear amplitude and growth. Using CMB priors, we perform a likelihood analysis. We find constraints on the amplitude of the signal that do not indicate a deviation from General Relativity.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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