Five per cent measurements of the growth rate from simulation-based modelling of redshift-space clustering in BOSS LOWZ
Five per cent measurements of the growth rate from simulation-based modelling of redshift-space clustering in BOSS LOWZ
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BOSS LOWZ 中基于模拟的红移空间聚类模型对增长率进行百分之五的测量
DOI：
10.1093/mnras/stab3111
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发表时间：
2021
影响因子：
4.8
通讯作者：
DeRose, Joseph
中科院分区：
文献类型：
--
作者：
Lange, Johannes U;Hearin, Andrew P;Leauthaud, Alexie;van den Bosch, Frank C;Guo, Hong;DeRose, Joseph
我们使用基于模拟的建模方法来分析BOSS LOZ样本在径向范围内的各向异性聚集，大大扩展了纯解析建模框架的可能性。我们的全尺度分析产生了对结构增长的限制，这是一个比任何其他类似红移的大尺度研究更严格的因素。推算出σ在≈0.25时为0.471±0.024，在σ为0.40时为f≈=0.430±0.025；普朗克宇宙微波背景分析对应的Λ清洁发展机制预测值分别为0.470±0.006和0.476±0.005。因此，我们的结果与普朗克一致，但也遵循了之前在σ8附近进行的低红移测量中看到的趋势，略低于Λ清洁发展机制+CMB的预测。我们发现，小径向尺度和大径向尺度在σ8上产生相互一致的值，但有1个−2.5σ暗示小尺度()相对于大尺度更倾向于较低的σ8值。我们分析了全范围径向尺度的约束能力，发现关于σ8的大部分多极信息都包含在这些尺度中。显然，一旦收集到准到非线性系统的宇宙学信息，大尺度模式只包含关于结构增长的少量额外信息。最后，我们比较了两个样本对星系-星系透镜振幅的预测与SDSS的测量结果，并根据我们的发现评估了透镜是低的影响。
We use a simulation-based modelling approach to analyse the anisotropic clustering of the BOSS LOWZ sample over the radial rangeto, significantly extending what is possible with a purely analytic modelling framework. Our full-scale analysis yields constraints on the growth of structure that are a factor of two more stringent than any other study on large scales at similar redshifts. We inferfσ8= 0.471 ± 0.024 at≈ 0.25, andfσ8= 0.430 ± 0.025 at≈ 0.40; the corresponding ΛCDM predictions of the Planck cosmic microwave background (CMB) analysis are 0.470 ± 0.006 and 0.476 ± 0.005, respectively. Our results are thus consistent with Planck, but also follow the trend seen in previous low-redshift measurements offσ8falling slightly below the ΛCDM + CMB prediction. We find that small- and large-radial scales yield mutually consistent values offσ8, but there are 1−2.5σ hints of small scales () preferring lower values forfσ8relative to larger scales. We analyse the constraining power of the full range of radial scales, finding that most of the multipole information aboutfσ8is contained in the scales. Evidently, once the cosmological information of the quasi-to-nonlinear regime has been harvested, large-scale modes contain only modest additional information about structure growth. Finally, we compare predictions for the galaxy–galaxy lensing amplitude of the two samples against measurements from SDSS and assess the lensing-is-low effect in light of our findings.