我们宇宙的非均匀CMB光谱特征和黑体光球
Unavoidable CMB spectral features and blackbody photosphere of our Universe
摘要：
宇宙微波背景辐射能谱中的光谱特征包含了大量关于宇宙早期物理过程的信息，z < 2 x 10^6。宇宙微波背景辐射的光谱畸变与其他宇宙学探测是互补的。事实上，CMB频谱中包含的大部分信息是无法通过任何其他方式获取的。这篇评论概述了宇宙历史上CMB光谱特征背后的主要物理学，集中在不可避免的扭曲上，并且必须存在于下一代拟议的CMB实验可观察到的水平。这里考虑的光谱畸变包括来自宇宙学复合的光谱特征，再电离过程中CMB被金属共振散射的光谱特征，这使我们能够测量它们的丰度，再电离过程中和之后的y型畸变，以及在红移z > 1.5 x 10^4时产生的μ型和i型（介于μ和y之间）畸变。
英文摘要：
Spectral features in the CMB energy spectrum contain a wealth of information about the physical processes in the early Universe, z < 2 x 10^6. The CMB spectral distortions are complementary to all other probes of cosmology. In fact, most of the information contained in the CMB spectrum is inaccessible by any other means. This review outlines the main physics behind the spectral features in the CMB throughout the history of the Universe, concentrating on the distortions which are inevitable and must be present at a level observable by the next generation of proposed CMB experiments. The spectral distortions considered here include spectral features from cosmological recombination, resonant scattering of CMB by metals during reionization which allows us to measure their abundances, y-type distortions during and after reionization and μ-type and i-type (intermediate between μand y) distortions created at redshifts z > 1.5 x 10^4.
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