微扰化的非高斯性
Non-Gaussianities from Perturbing Recombination
摘要：
我们近似计算的双谱诱导的CMB温度的波动，在标准的复合时期。在所有的二阶源，可以诱导非高斯在重组过程中，我们集中在那些成比例的自由电子密度的扰动，这是一个比其他一阶扰动大约5倍。这一项通过延迟复合时间和改变光子扩散尺度来诱导一些非高斯性。我们发现信号不是尺度不变的，峰值在压缩三角形上，在第一个声峰的尺度附近具有较小的多极子，其大小对应于有效的fNL ~-3.5，如果测量温度和极化，普朗克可以勉强检测到。
英文摘要：
We approximately compute the bispectrum induced on the CMB temperature by fluctuations in the standard recombination epoch. Of all the second order sources that can induce non-Gaussianity during recombination, we concentrate on those proportional to the perturbation in the free electron density, which is about a factor of 5 larger than the other first order perturbations. This term induces some non-Gaussianity by delaying the time of recombination and by changing the photon diffusion scale. We find that the signal is not scale invariant, peaked on squeezed triangles with the smaller multipole around the scale of the first acoustic peak, and that its size corresponds to an effective f_NL ~ -3.5, which could be marginally detected by Planck if both temperature and polarization are measured.
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