论文标题
CMB极化角度的统计
Statistics of CMB polarization angles
论文作者
论文摘要
我们研究CMB极化角$ψ$的分布函数，重点是Planck 2018 CMB地图。我们扩展了高斯相关的$ q $和$ u $ stokes参数的Preece＆Battye（2014）的模型，以允许非零均值。当$ q $和$ u $的差异相等，其协方差和均值为零时，极化角度均匀分布。否则，统一分布将由谐波以$2ψ$和$4ψ$阶段进行调节。这些调制在Planck 2018 CMB地图中可见。此外，与功率谱相比，$ u $的平均值是特殊的。
We study the distribution functions of the CMB polarization angle $ψ$, focusing on the Planck 2018 CMB maps. We extend the model of Preece & Battye (2014) of Gaussian correlated $Q$ and $U$ Stokes parameters to allow nonzero means. When the variances of $Q$ and $U$ are equal and their covariance and means are zero, the polarization angle is uniformly distributed. Otherwise the uniform distribution will be modulated by harmonics with $2ψ$ and $4ψ$ phases. These modulations are visible in the Planck 2018 CMB maps. Furthermore, the mean value of $U$ is peculiar compared to the power spectrum.
