We present a cosmological analysis of the combination of the DES-Y3, KiDS-1000 and HSC-DR1 weak lensing samples under a joint harmonic-space pipeline making use of angular scales down to ℓ_max=4500, corresponding to significantly smaller scales (δθ ~ 2.4') than those commonly used in cosmological weak lensing studies. We are able to do so by accurately modelling non-linearities and the impact of baryonic effects using Baccoemu. We find S ₈ ≡ σ ₈√(Ω_m/0.3) = 0.795^+0.015 _-0.017, in relatively good agreement with CMB constraints from Planck (less than ~1.8σ tension), although we obtain a low value of Ω_m =0.212^+0.017 _-0.032, in tension with Planck at the ~3σ level. We show that this can be recast as an H₀ tension if one parametrises the amplitude of fluctuations and matter abundance in terms of variables without hidden dependence on H₀. Furthermore, we find that this tension reduces significantly after including a prior on the distance-redshift relationship from BAO data, without worsening the fit. In terms of baryonic effects, we show that failing to model and marginalise over them on scales ℓ ≲ 2000 does not significantly affect the posterior constraints for DES-Y3 and KiDS-1000, but has a mild effect on deeper samples, such as HSC-DR1. This is in agreement with our ability to only mildly constrain the parameters of the Baryon Correction Model with these data.

中文翻译：

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小尺度宇宙剪切：DES-Y3、KiDS-1000 和 HSC-DR1


我们在联合谐波空间管道下对 DES-Y3、KiDS-1000 和 HSC-DR1 弱透镜样本的组合进行了宇宙学分析，使用的角度尺度低至 ℓ _max = 4500，对应于明显更小的尺度 (δθ ~ 2.4') 比宇宙学弱透镜研究中常用的那些要好。我们能够通过准确地建模非线性和重子效应的影响来做到这一点巴克科穆。我们发现S ₈ == σ ₈ √(Ω _m /0.3) = 0.795 ^+0.015 _-0.017 ，与 CMB 约束相对较好地一致普朗克（小于~1.8 σ张力），尽管我们得到了一个低值 Ω _m =0.212 ^+0.017 _-0.032 ，在张力下普朗克在〜3σ水平。我们证明，如果将波动幅度和物质丰度参数化为变量而不隐藏对 H _{0 的}依赖性，则可以将其重新转换为 H ₀张力。此外，我们发现在包含 BAO 数据中的距离-红移关系的先验后，这种张力显着降低，而不会恶化拟合。就重子效应而言，我们表明未能在尺度上对它们进行建模和边缘化ℓ ≲ 2000 对 DES-Y3 和 KiDS-1000 的后验约束没有显着影响，但对更深的样本（例如 HSC-DR1）有轻微影响。这与我们仅用这些数据轻微约束重子校正模型参数的能力是一致的。