标题： 再电离不均匀性对宇宙微波背景各向异性的影响 显示英文标题

标题： The Impact of Inhomogeneous Reionization on Cosmic Microwave Background Anisotropy

摘要： 宇宙中最初在红移 z = 1100 形成的氢原子在 5 < z < 60 之间被再电离。 这一转变很可能经历了一个部分电离的混合阶段。 我们开发了一种解析方法，用于计算这种不均匀自由电子分布对宇宙微波背景（CMB）的汤姆孙散射效应。 我们研究了再电离过程的两个模型，其中一个模型将电离区域与平滑密度场的高密度区域联系起来。 我们发现产生的各向异性具有一个功率谱，在对应于电离区域大小的角度尺度上达到峰值，并且其宽度反映了它们之间的相关性。 幅度存在很大不确定性，这取决于坍缩天体重新电离周围介质的效率。 我们计算了在从高分辨率CMB图中确定宇宙学参数时忽略不均匀再电离的影响，并发现这可能是一个重要的系统误差来源。 显示英文摘要

摘要： Hydrogen atoms in the Universe that initially formed at redshift z = 1100 were reionized at 5 < z < 60. It is likely that this transition proceeded through a mixed phase of partial ionization. We develop an analytic approach to calculating the effect on the cosmic microwave background (CMB) of Thomson scattering off this inhomogeneous distribution of free electrons. We study two models of the reionization process, one of which associates ionized patches with overdense regions of the smoothed density field. We find the generated anisotropy to have a power spectrum which peaks at angular scales corresponding to the extent of the ionized regions, and has a width that reflects the correlations between them. There is considerable uncertainty in the amplitude, which depends on how efficiently collapsed objects can reionize the surrounding medium. We calculate the effect of neglecting inhomogeneous reionization in the determination of cosmological parameters from high resolution CMB maps and find that it may be a significant source of systematic error.