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arXiv 1409.3697astro-ph.COgr-qc
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具有增长率数据的$Λ$ CDM模型的一种新的零检验

A novel null test for the $Λ$CDM model with growth-rate data

Savvas Nesseris, Domenico Sapone

摘要:

目前和即将进行的调查将以极高的精度测量宇宙学参数。这些观测的主要目标是消除一些目前可行的宇宙学模型,这些模型是为了解释晚期加速膨胀(无论是真实的还是只是推断的)。然而,宇宙学中使用的大多数统计检验都有一个很强的要求:使用模型来拟合数据。最近,人们越来越感兴趣的是寻找模型独立的测试,即具有完全依赖于观察到的量而不是模型的函数,例如[1]。在这封信中,我们提出了一个替代的一致性检查在微扰水平的均匀和各向同性宇宙充满了暗能量组件。这个测试利用了物质扰动数据的增长,它不仅能够测试均匀和各向同性的宇宙,而且在弗里德曼-勒梅特-罗伯逊-沃克宇宙的框架内,如果暗能量分量能够聚集,如果数据中存在张力,或者如果我们正在处理重力的修改。

英文摘要:

Current and upcoming surveys will measure the cosmological parameters with an extremely high accuracy. The primary goal of these observations is to eliminate some of the currently viable cosmological models created to explain the late time accelerated expansion (either real or only inferred). However, most of the statistical tests used in cosmology have a strong requirement: the use of a model to fit the data. Recently there has been an increased interest on finding tests that are model independent, i.e. to have a function that depends entirely on observed quantities and not on the model, see for instance [1]. In this letter we present an alternative consistency check at the perturbative level for a homogeneous and isotropic Universe filled with a dark energy component. This test makes use of the growth of matter perturbations data and it is able to not only test the homogeneous and isotropic Universe but also, within the framework of a Friedmann-Lemaître-Robertson-Walker Universe, if the dark energy component is able to cluster, if there is a tension in the data or if we are dealing with a modification of gravity.

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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