AI 中文总结
该研究基于KiDS-1000数据，利用截断剪切相关函数，结合截断与未截断探针改进了wCDM模型参数约束，为重子反馈强度提供上限，提升了内禀对齐的约束精度。
AI 中文摘要
我们利用“截断”剪切相关函数，基于千度巡天第四次数据发布（KiDS-1000）给出了改进的宇宙学约束。截断方法会过滤弱引力透镜数据推断出的投影密度场中的最高密度区域，使两点函数能够提取额外的宇宙学信息。我们首次对截断引力透镜统计量的系统误差影响进行建模，包括内禀对齐、重子反馈、测光红移不确定性以及源-透镜成团效应。我们基于纯暗物质和流体动力学N体模拟训练高斯过程模拟器，以预测截断和传统“未截断”剪切相关函数的宇宙学及系统依赖关系。我们发现，截断与未截断探针的结合相比传统方法，改进了wCDM模型自由参数的约束，使S₈的不确定度收紧16%，w₀的不确定度收紧24%。我们的约束为Ωₘ=0.263⁺⁰.⁰³⁵₋₀.₀₃₈、S₈=0.724⁺⁰.⁰²⁷₋₀.₀₂₇、w₀=-1.24⁺⁰.²⁶₋₀.₂₈，与ΛCDM模型及Asgari等人（2021）的宇宙剪切分析一致，该分析采用完全独立的基于模拟和模拟器的正演建模方法。我们还发现，截断统计量中的互补信息为重子反馈强度提供了上限，并将内禀对齐的约束改进了27%。
英文摘要
We present improved cosmological constraints from the fourth data release of the Kilo-Degree Survey ("KiDS-1000") using "clipped" shear correlation functions. Clipping filters the projected density field inferred from weak lensing data for the highest-density regions, allowing for two-point functions to extract additional cosmological information. We model, for the first time, the impact of systematics on clipped lensing statistics, including intrinsic alignments, baryonic feedback, photometric redshift uncertainties, and source-lens clustering. We train Gaussian process emulators on dark-matter-only and hydrodynamical $N$-body simulations to predict the cosmological and systematic dependence of both the clipped and conventional, "unclipped" shear correlation functions. We find that the combination of the clipped and unclipped probes improves the constraints on the free parameters of the $w$CDM model relative to the conventional approach, with a 16% tightening of the $S_8$ uncertainty and 24% for $w_0$. Our constraints, $Ω_{\rm m} = 0.263^{+0.035}_{-0.038}$, $S_8=0.724^{+0.027}_{-0.027}$, and $w_0 = -1.24^{+0.26}_{-0.28}$, are consistent with the $Λ$CDM model and with the cosmic shear analysis of Asgari et al. (2021) via a completely independent simulation- and emulator-based forward-modelling approach. We also find the complimentary information in the clipped statistic provides an upper limit on the baryon feedback strength, and improves the constraints on intrinsic alignments by 27%.
Comments24 pages, 15 figures, submitted to MNRAS
