论文标题
X切割宇宙剪切：最佳地消除对重型和非线性物理的敏感性，并应用于深色能源调查1年剪切数据
x-cut Cosmic Shear: Optimally Removing Sensitivity to Baryonic and Nonlinear Physics with an Application to the Dark Energy Survey Year 1 Shear Data
论文作者
论文摘要
我们提出了一种称为$ x $ cut宇宙剪切的新方法，该方法从两点宇宙剪切信号中最佳地消除了对模型较差的尺度的敏感性。我们表明，可以在几分钟内从相关函数协方差矩阵中计算$ x $ - cut宇宙剪切协方差矩阵，从而使可能性分析几乎没有额外的计算成本。此外，我们展示了如何将$ x $ cut宇宙剪切概括为Galaxy-Galaxy镜头。对黑暗能源调查的$ x $ cut宇宙剪切分析（DESY1）剪切数据，我们减少了$ s_8 =σ_8（ω_m / 0.3） ^ {0.5} $的错误，相对于与同一PRIORS和ANGULAL SCAPE CARITION的相关函数相关的模型，相对于相关函数的模型，相对于相关函数的模型，相对于相关的模型，$ 32 \％。在很大程度上是由小角度尺度的信息驱动的，我们的结果是$ s_8 = 0.734 \ pm 0.026 $，在宇宙微波背景的Planck Legacy分析中产生了$2.6σ$张力。除了减轻重型建模的不确定性外，我们的方法还可以用来最佳地限制大量修饰的重力理论，在这些理论中，计算限制使其不可避免地将功率谱模拟至极小的尺度。我们代码的关键部分是公开可用的。
We present a new method, called $x$-cut cosmic shear, which optimally removes sensitivity to poorly modeled scales from the two-point cosmic shear signal. We show that the $x$-cut cosmic shear covariance matrix can be computed from the correlation function covariance matrix in a few minutes, enabling a likelihood analysis at virtually no additional computational cost. Further we show how to generalize $x$-cut cosmic shear to galaxy-galaxy lensing. Performing an $x$-cut cosmic shear analysis of the Dark Energy Survey Year 1 (DESY1) shear data, we reduce the error on $S_8= σ_8 (Ω_m / 0.3) ^ {0.5}$ by $32 \%$ relative to a correlation function analysis with the same priors and angular scale cut criterion, while showing our constraints are robust to different baryonic feedback models. Largely driven by information at small angular scales, our result, $S_8= 0.734 \pm 0.026$, yields a $2.6 σ$ tension with the Planck Legacy analysis of the cosmic microwave background. As well as alleviating baryonic modelling uncertainties, our method can be used to optimally constrain a large number of theories of modified gravity where computational limitations make it infeasible to model the power spectrum down to extremely small scales. The key parts of our code are made publicly available.
