Skewness of Cosmic Microwave Background Temperature Fluctuations Due to Non-linear Gravitational Instability
Skewness of Cosmic Microwave Background Temperature Fluctuations Due to Non-linear Gravitational Instability
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非线性引力不稳定性导致的宇宙微波背景温度波动的偏度
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
A. Starobinsky
中科院分区：
文献类型：
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作者：
D. Munshi;T. Souradeep;A. Starobinsky
本文定量计算了初始高斯绝热扰动产生的宇宙微波背景辐射（CMB）的温度涨落的偏度，该温度涨落是由于在物质支配阶段对引力势的非线性修正而产生的，具有平坦的（Harrison-Zeldovich）谱。对于标准的CDM模型，这种效应似乎比以前预期的要小，即使对于小角度，也低于宇宙方差极限。偏度的符号与密度扰动的偏度的符号相反。
Skewness of temperature fluctuations of the cosmic microwave background (CMB) produced by initially Gaussian adiabatic perturbations with the flat (Harrison-Zeldovich) spectrum, which arises due to non-linear corrections to a gravitational potential at the matter-dominated stage, is calculated quantitatively. For the standard CDM model, the effect appears to be smaller than expected previously and lies below the cosmic variance limit even for small angles. The sign of the skewness is opposite to that of the skewness of density perturbations.