论文标题
宇宙剪切的一种新型方法，用于生长的无偏测量
A novel method for unbiased measurements of growth with cosmic shear
论文作者
论文摘要
我提出了一种通过弱透镜宇宙剪切的功率谱来测量宇宙结构生长的新技术。它基于模板拟合方法，其中镜头的红移依赖性振幅调节了固定的模板功率谱。 Such an amplitude, which is promoted to a free parameter and fit against tomographic cosmic shear data, reads $D(z)\,σ_8\,Ω_{{\rm m},0}=:Ωσ_8(z)$, with $D(z)$ the growth factor, $σ_8$ a proxy for the overall amplitude of the matter power spectrum, and $ω_ {{\ rm m}，0} $当前的物质丰度。我表明，此方法能够在红移的百分比下正确地重建$ωσ_8$，从而使我们能够通过观察离散的示踪剂来衡量公正的结构的生长。此外，我仅利用线性尺度上的测量。该方法与偏见和增长的测量值高度互补，来自Galaxy聚类分析的$Bσ_8（z）$和$fσ_8（z）$。我还证明，由于包含Alcock-Paczyński参数，该方法与模板中宇宙学参数的错误选择是可靠的。
I present a new technique for the measurement of the growth of cosmic structures via the power spectrum of weak lensing cosmic shear. It is based on a template-fitting approach, where a redshift-dependent amplitude of lensing modulates a fixed template power spectrum. Such an amplitude, which is promoted to a free parameter and fit against tomographic cosmic shear data, reads $D(z)\,σ_8\,Ω_{{\rm m},0}=:Ωσ_8(z)$, with $D(z)$ the growth factor, $σ_8$ a proxy for the overall amplitude of the matter power spectrum, and $Ω_{{\rm m},0}$ the present-day matter abundance. I show that this method is able to correctly reconstruct $Ωσ_8$ at the per cent level across redshift, thus allowing us to measure the growth of structures unbiased by observing discrete tracers. Moreover, I only makes use of measurements on linear scales. The method is highly complementary to measurements of the bias and growth, $bσ_8(z)$ and $fσ_8(z)$, from galaxy clustering analysis. I also demonstrate that the method is robust against an incorrect choice of cosmological parameters in the template, thanks to the inclusion of an Alcock-Paczyński parameter.
