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arXiv 2105.09545astro-ph.CO
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几何与增长:具有KiDS-1000的平坦ΛCDM模型的内部一致性

Geometry vs growth: Internal consistency of the flat ΛCDM model with KiDS-1000

J. Ruiz-Zapatero, Benjamin Stölzner, Benjamin Joachimi, Marika Asgari, Maciej Bilicki, Andrej Dvornik, Benjamin Giblin, Catherine Heymans, Hendrik Hildebrandt, … 展开作者

J. Ruiz-Zapatero, Benjamin Stölzner, Benjamin Joachimi, Marika Asgari, Maciej Bilicki, Andrej Dvornik, Benjamin Giblin, Catherine Heymans, Hendrik Hildebrandt, Arun Kannawadi, Konrad Kuijken, TilmanTröster, Jan Luca van den Busch, Angus H. Wright

摘要:

我们对平坦$Λ$ CDM模型进行了多探针自洽性检验,目的是探索高红移和低红移宇宙学观测之间的紧张关系的潜在原因。我们将模型分为两个理论制度所确定的平滑背景(几何)和物质密度波动的演变(增长),每个由一个独立的一组λ冷暗物质($Λ$ CDM)宇宙学参数。这个扩展模型的约束相结合的弱引力透镜测量从千度巡天,从斯隆数字巡天活动和六度场星系巡天星系团的签名,角重子声学尺度和原始标量波动功率谱测量$\textit{Planck}$宇宙微波背景(CMB)数据。我们发现强的几何和生长参数之间的一致性,并与后的标准$Λ$ CDM分析。由参数$S_8$测量的物质密度波动幅度的张力持续在3 $σ$左右,对于组合探针,$1.5\,\%$约束为$S_8 = 0.776_{-0.008}^{+0.016}$。我们还观察到一个不太显着的偏好(至少$2σ$)为更高的哈勃常数,$H_0 = 70.5^{+0.7}_{-1.5}\,{\rm km\, s^{-1} Mpc^{-1}}$的值,以及为更低的值的总物质密度参数$Ω_{\rm{m}} = 0.289^{+0.007}_{-0.005}$相比,完整的$\textit{Planck}$分析。在探针组合中包括CMB信息的子集增强了这些差异而不是减轻它们,我们将其与$\textit{Planck}$数据中的低多极和高多极之间的差异联系起来。

英文摘要:

We carry out a multi-probe self-consistency test of the flat $Λ$CDM model with the aim of exploring potential causes of the reported tensions between high- and low-redshift cosmological observations. We divide the model into two theory regimes determined by the smooth background (geometry) and the evolution of matter density fluctuations (growth), each governed by an independent set of Lambda Cold Dark Matter ($Λ$CDM) cosmological parameters. This extended model is constrained by a combination of weak gravitational lensing measurements from the Kilo-Degree Survey, galaxy clustering signatures extracted from Sloan Digital Sky Survey campaigns and the Six-Degree Field Galaxy Survey, and the angular baryon acoustic scale and the primordial scalar fluctuation power spectrum measured in $\textit{Planck}$ cosmic microwave background (CMB) data. We find strong consistency between the geometry and growth parameters, and with the posterior of standard $Λ$CDM analysis. Tension in the amplitude of matter density fluctuations as measured by the parameter $S_8$ persists at around 3$σ$, with a $1.5\,\%$ constraint of $S_8 = 0.776_{-0.008}^{+0.016}$ for the combined probes. We also observe a less significant preference (at least $2σ$) for higher values of the Hubble constant, $H_0 = 70.5^{+0.7}_{-1.5}\,{\rm km\, s^{-1} Mpc^{-1}}$, as well as for lower values of the total matter density parameter $Ω_{\rm{m}} = 0.289^{+0.007}_{-0.005}$ compared to the full $\textit{Planck}$ analysis. Including the subset of the CMB information in the probe combination enhances these differences rather than alleviate them, which we link to the discrepancy between low and high multipoles in $\textit{Planck}$ data.

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