论文标题
宇宙微波背景频谱畸变从雷利散射以二阶散射
Cosmic microwave background spectral distortions from Rayleigh scattering at second order
论文作者
论文摘要
在严格的二阶宇宙学扰动理论中，首次计算出瑞利散射的宇宙微波背景（CMB）光谱失真。新的光谱失真对$ 10^{ - 2} <k {\ rm mpc}/h <1 $的声学耗散敏感，这略微扩展了受CMB各向异性约束的比例。光谱形状与温度扰动或任何其他传统的光谱扭曲不同，例如$ y $和$μ$。新的光谱失真在晚期宇宙中并未形成，与原始$ y $扭曲变性的热sunyaev-zel'dovich效应不同，因为光子对于瑞利散射必须很热。因此，理想的测量可以将信号与其他效果区分开，并在重组过程中提取新信息。假设宇宙学参数与最近的CMB各向异性测量值一致，我们发现新的光谱失真为$ 6.5 \ times 10^{ - 3} $ jy/str，这比当前提出的目标灵敏度范围小的数量级小。
Cosmic microwave background (CMB) spectral distortion from Rayleigh scattering is calculated for the first time in rigorous second-order cosmological perturbation theory. The new spectral distortion is sensitive to acoustic dissipation at $10^{-2}<k{\rm Mpc}/h<1$, which slightly extends the scale constrained by the CMB anisotropies. The spectral shape is different from either temperature perturbations or any other traditional spectral distortions from Compton scattering, such as $y$ and $μ$. The new spectral distortion is not formed in the late Universe, unlike the thermal Sunyaev-Zel'dovich effect degenerated with the primordial $y$ distortions since photons must be hot for Rayleigh scattering. Therefore, ideal measurements can distinguish the signal from the other effects and extract new information during recombination. Assuming cosmological parameters consistent with the recent CMB anisotropy measurements, we find the new spectral distortion is $6.5\times 10^{-3}$Jy/str, which is one order of magnitude smaller than the currently proposed target sensitivity range of voyage 2050.
