论文标题
偏振旋转及其与温度和电子极化的相关性对CMB功率谱和双光谱的影响
The effects on CMB power spectra and bispectra from the polarization rotation and its correlations with temperature and E-polarization
论文作者
论文摘要
Chern-Simons项（宇宙轴状的磁场夫妇沿电磁场）具有旋转CMB极化方向并破坏CPT对称性的效果。这种旋转将改变CMB功率谱，无论旋转角度是各向同性或各向异性的。在本文中，我们通过进一步考虑（各向异性）旋转角$α$与CMB温度与（未座的）$ E $极化场之间的相关性来重新审视此问题。这些相关性可以在绝热初始条件下具有非零势的轴突样模型中产生。我们首先研究了这些相关性如何对CMB功率谱进行进一步的修改，然后计算CMB Bispectra的温度和旋转极化场。如果不存在$tα$和$eα$相关性，这些双光谱将消失。因此，它们在搜索CPT违规以及$Tα$和$eα$相关性中很有用。
The Chern-Simons term, through which the cosmic Axion-like field couples to the electromagnetic field, has the effect to rotate CMB polarization directions and to break the CPT symmetry. This rotation will change the CMB power spectra, no matter isotropic or anisotropic the rotation angle is. In this paper we revisit this issue by further considering the correlations between the (anisotropic) rotation angle $α$ and the CMB temperature and (unrotated) $E$ polarization fields. These correlations could be generated in the Axion-like models with nonzero potential under the adiabatic initial condition. We first investigate how these correlations contribute further modifications to the CMB power spectra, then calculate the CMB bispectra for the temperature and rotated polarization fields. These bispectra would vanish if the $Tα$ and $Eα$ correlations are absent. So, they are useful in searching for CPT violation and the $Tα$ and $Eα$ correlations arisen in the Axion-like models.
