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arXiv 1509.02191astro-ph.COgr-qchep-th
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红移巡天尺度下暗能量的有效理论

Effective Theory of Dark Energy at Redshift Survey Scales

Jérôme Gleyzes, David Langlois, Michele Mancarella, Filippo Vernizzi

摘要:

我们探讨的现象学后果一般晚的时间修改的重力准静态近似,在冷暗物质的情况下,非最小耦合到引力部门。假设光谱和光度调查的配置参数类似的欧几里得任务,我们从三个观测量:在红移空间中的星系功率谱,层析弱透镜剪切功率谱和综合萨克斯-沃尔夫效应和星系分布之间的相关谱得到我们的有效描述的约束。特别是,$Λ$ CDM作为基准模型和我们的有效函数的时间依赖性的具体选择,我们进行了Fisher矩阵分析,发现未边缘化的$68\%$ CL错误的参数描述的重力修改的顺序为$σ\sim10^{-2}$ - $10^{-3}$。我们还考虑了其他两个基准模型。CDM的非最小耦合增强了修正重力的作用,从而减小了上述统计误差。在所有的情况下,我们发现,参数是高度退化的,这防止了逆的Fisher矩阵。其中一些简并可以通过结合所有三个观测探测器来打破。

英文摘要:

We explore the phenomenological consequences of general late-time modifications of gravity in the quasi-static approximation, in the case where cold dark matter is non-minimally coupled to the gravitational sector. Assuming spectroscopic and photometric surveys with configuration parameters similar to those of the Euclid mission, we derive constraints on our effective description from three observables: the galaxy power spectrum in redshift space, tomographic weak-lensing shear power spectrum and the correlation spectrum between the integrated Sachs-Wolfe effect and the galaxy distribution. In particular, with $Λ$CDM as fiducial model and a specific choice for the time dependence of our effective functions, we perform a Fisher matrix analysis and find that the unmarginalized $68\%$ CL errors on the parameters describing the modifications of gravity are of order $σ\sim10^{-2}$--$10^{-3}$. We also consider two other fiducial models. A nonminimal coupling of CDM enhances the effects of modified gravity and reduces the above statistical errors accordingly. In all cases, we find that the parameters are highly degenerate, which prevents the inversion of the Fisher matrices. Some of these degeneracies can be broken by combining all three observational probes.

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