论文标题
对综合剪切3点相关函数的响应方法：重型效应对小尺度的影响
Response approach to the integrated shear 3-point correlation function: the impact of baryonic effects on small scales
论文作者
论文摘要
集成的剪切3点相关函数$ζ_ {\ pm} $是宇宙剪切场的高阶统计量，它描述了2分相关函数的调制$ξ_ {\ pm} $由现场中的长波长度描述。在这里，我们介绍了一个新的理论模型来计算$ζ_ {\ pm} $，该模型在小角度尺度上是准确的，并且可以考虑到Baryonic反馈效果。我们的模型建立在这样的意识到的基础上，即小规模$ζ_ {\ pm} $在挤压极限中以非线性物质Biseptrum主导，可以使用非线性物质功率谱及其一阶响应功能对密度和潮汐场扰动进行准确评估。我们通过证明它重现了在模拟宇宙剪切图中测量的小规模$ζ_ {\ pm} $来证明我们的模型的准确性。 Baryonic反馈的影响只有通过对非线性物质功率谱的相应影响才能有效地进入，从而使这些天体物理对$ζ_ {\ pm} $的影响与当前对$ξ_ {\ pm pm} $相似的方式类似。 Using a simple idealized Fisher matrix forecast for a DES-like survey we find that, compared to $ξ_{\pm}$, a combined $ξ_{\pm}\ \&\ ζ_{\pm}$ analysis can lead to improvements of order $20-40\%$ on the constraints of cosmological parameters such as $σ_8$ or the dark energy equation of state参数$ W_0 $。我们发现，对男性反馈参数的约束的改进水平相似，这加强了宇宙剪切数据的前景，不仅可以在宇宙学，而且还获得了天体物理反馈模型的严格约束。这些令人鼓舞的结果，激发了对综合剪切3点相关函数的未来工作，以应用于实际调查数据的应用。
The integrated shear 3-point correlation function $ζ_{\pm}$ is a higher-order statistic of the cosmic shear field that describes the modulation of the 2-point correlation function $ξ_{\pm}$ by long-wavelength features in the field. Here, we introduce a new theoretical model to calculate $ζ_{\pm}$ that is accurate on small angular scales, and that allows to take baryonic feedback effects into account. Our model builds on the realization that the small-scale $ζ_{\pm}$ is dominated by the nonlinear matter bispectrum in the squeezed limit, which can be evaluated accurately using the nonlinear matter power spectrum and its first-order response functions to density and tidal field perturbations. We demonstrate the accuracy of our model by showing that it reproduces the small-scale $ζ_{\pm}$ measured in simulated cosmic shear maps. The impact of baryonic feedback enters effectively only through the corresponding impact on the nonlinear matter power spectrum, thereby permitting to account for these astrophysical effects on $ζ_{\pm}$ similarly to how they are currently accounted for on $ξ_{\pm}$. Using a simple idealized Fisher matrix forecast for a DES-like survey we find that, compared to $ξ_{\pm}$, a combined $ξ_{\pm}\ \&\ ζ_{\pm}$ analysis can lead to improvements of order $20-40\%$ on the constraints of cosmological parameters such as $σ_8$ or the dark energy equation of state parameter $w_0$. We find similar levels of improvement on the constraints of the baryonic feedback parameters, which strengthens the prospects for cosmic shear data to obtain tight constraints not only on cosmology but also on astrophysical feedback models. These are encouraging results that motivate future works on the integrated shear 3-point correlation function towards applications to real survey data.
