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首页> 外文期刊>Astronomy and astrophysics >The VIMOS Public Extragalactic Redshift Survey (VIPERS) - Gravity test from the combination of redshift-space distortions and galaxy-galaxy lensing at 0.5?&?z?&?1.2
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The VIMOS Public Extragalactic Redshift Survey (VIPERS) - Gravity test from the combination of redshift-space distortions and galaxy-galaxy lensing at 0.5?&?z?&?1.2

机译：VIMOS公共河外红移调查（VIPERS）-重力测试，结合了红移空间畸变和星系-银河系透镜在0.5≤z z≤1.2的条件下进行

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We carry out a joint analysis of redshift-space distortions and galaxy-galaxy lensing, with the aim of measuring the growth rate of structure; this is a key quantity for understanding the nature of gravity on cosmological scales and late-time cosmic acceleration. We make use of the final VIPERS redshift survey dataset, which maps a portion of the Universe at a redshift of z ? 0.8 , and the lensing data from the CFHTLenS survey over the same area of the sky. We build a consistent theoretical model that combines non-linear galaxy biasing and redshift-space distortion models, and confront it with observations. The two probes are combined in a Bayesian maximum likelihood analysis to determine the growth rate of structure at two redshifts z = 0.6 and z = 0.86 . We obtain measurements of f σ _(8)(0.6) = 0.48 ± 0.12 and f σ _(8)(0.86) = 0.48 ± 0.10 . The additional galaxy-galaxy lensing constraint alleviates galaxy bias and σ _(8) degeneracies, providing direct measurements of f and σ _(8) : [ f (0.6), σ _(8)(0.6)] = [0.93 ± 0.22,0.52 ± 0.06] and [ f (0.86), σ _(8)(0.86)] = [0.99 ± 0.19,0.48 ± 0.04] . These measurements are statistically consistent with a Universe where the gravitational interactions can be described by General Relativity, although they are not yet accurate enough to rule out some commonly considered alternatives. Finally, as a complementary test we measure the gravitational slip parameter, E _(G) , for the first time at z > 0.6 . We find values of E ?_(G)(0.6) = 0.16±0.09 and E ?_(G)(0.86) = 0.09±0.07, when E _(G) is averaged over scales above 3 h ~(-1)Mpc . We find that our E _(G) measurements exhibit slightly lower values than expected for standard relativistic gravity in a ΛCDM background, although the results are consistent within 1?2 σ .
机译：我们对红移空间畸变和星系-星系透镜进行了联合分析，目的是测量结构的增长率。这是在宇宙学尺度上理解引力性质和后期宇宙加速的关键量。我们利用了最终的VIPERS红移调查数据集，该数据集将z的红移映射了宇宙的一部分。 0.8以及来自CFHTLenS的镜头数据在天空的相同区域进行测量。我们建立了一个一致的理论模型，该模型将非线性星系偏差模型和红移空间失真模型结合在一起，并通过观测来应对。在贝叶斯最大似然分析中将两种探针结合在一起，以确定在两个红移z = 0.6和z = 0.86时结构的生长速率。我们获得fσ_（8）（0.6）= 0.48±0.12和fσ_（8）（0.86）= 0.48±0.10的测量值。附加的星系-星系镜头约束减轻了星系偏差和σ_（8）的简并性，可直接测量f和σ_（8）：[f（0.6），σ_（8）（0.6）] = [0.93±0.22 ，[0.52±0.06]和[f（0.86），σ_（8）（0.86）] ＝ [0.99±0.19，0.48±0.04]。这些测量在统计学上与宇宙相对一致，在宇宙中可以用广义相对论来描述引力相互作用，尽管它们还不够准确，无法排除一些通常被认为是的替代方案。最后，作为补充测试，我们在z> 0.6时首次测量了重力滑移参数E _（G）。当E _（G）在3 h〜（-1）以上的尺度上平均时，我们发现E _（G）（0.6）= 0.16±0.09和E _（G）（0.86）= 0.09±0.07的值Mpc。我们发现我们的E _（G）测量值显示的值比ΛCDM背景下标准相对论引力的期望值低，尽管结果在1？2σ内是一致的。

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