Cosmological perturbations at second order and recombination perturbed
Cosmological perturbations at second order and recombination perturbed
复制标题
二阶宇宙学扰动和重组扰动
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
M. Zaldarriaga
中科院分区：
文献类型：
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作者：
L. Senatore;S. Tassev;M. Zaldarriaga
我们导出了包含一阶电子数密度微扰δe影响的宇宙学微扰演化的完整的二阶方程组。我们对宇宙复合历史的微扰进行了详细的分析，并证明了皮布尔斯有效三能级原子的微扰版本足以获得小于1 Mpc−1的共动波数的δe演化。我们严格计算了Lyα逃逸几率的微扰，并在一个很好的近似下表明它受局域重子速度发散的控制.对于长于光子扩散尺度的模式，我们发现δe在复合过程中相对于其他一阶量在二阶时产生CMB各向异性的因子大约增加了5倍。利用这些结果，在一个配套文件中，我们计算重组过程中产生的CMB双谱。
We derive the full set of second-order equations governing the evolution of cosmological perturbations, including the effects of the first-order electron number density perturbations, δe. We provide a detailed analysis of the perturbations to the recombination history of the universe and show that a perturbed version of the Peebles effective 3-level atom is sufficient for obtaining the evolution of δe for comoving wavenumbers smaller than 1 Mpc−1. We calculate rigorously the perturbations to the Lyα escape probability and show that to a good approximation it is governed by the local baryon velocity divergence. For modes longer than the photon diffusion scale, we find that δe is enhanced during recombination by a factor of roughly 5 relative to other first-order quantities sourcing the CMB anisotropies at second order. Using these results, in a companion paper we calculate the CMB bispectrum generated during recombination.
影响因子：
8.7
作者：
Komatsu, E.;Smith, K. M.;Wright, E. L.
通讯作者：
Wright, E. L.