Dependence of the cosmic microwave background lensing power spectrum on the matter density
Dependence of the cosmic microwave background lensing power spectrum on the matter density
复制标题
宇宙微波背景透镜功率谱对物质密度的依赖性
DOI：
10.1093/mnras/stu1971
复制
发表时间：
2014
影响因子：
4.8
通讯作者：
M. White
中科院分区：
文献类型：
--
作者：
Z. Pan;L. Knox;M. White
宇宙微波背景辐射中的各向异性为检验大尺度结构的形成和演化模型提供了最好的实验室。宇宙微波背景各向异性谱中的丰富特征，结合高度精确的观测和理论预测，也使我们能够同时约束一些宇宙学参数。随着观测的进展，在更小的角度尺度上的测量提供了越来越多的杠杆作用。这些较小的角度尺度通过引力透镜效应提供了物质密度的灵敏测量。本文对CMB各向异性透镜效应依赖于物质密度的方式作了分析解释，指出主要效应来自于由视界交叉和物质辐射相等之间的小尺度势的衰减所决定的物质功率谱的形状。
The anisotropies in the cosmic microwave background (CMB) provide our best laboratory for testing models of the formation and evolution of large-scale structure. The rich features in the cosmic microwave background anisotropy spectrum, in combination with highly precise observations and theoretical predictions, also allow us to simultaneously constrain a number of cosmological parameters. As observations have progressed, measurements at smaller angular scales have provided increasing leverage. These smaller angular scales provide sensitive measures of the matter density through the eect of gravitational lensing. In this work we provide an analytic explanation of the manner in which the lensing of CMB anisotropies depends on the matter density, nding that the dominant eect comes from the shape of the matter power spectrum set by the decay of small-scale potentials between horizon crossing and matter-radiation equality.