论文标题
从WMAP和Planck宇宙微波背景极化数据中，对宇宙双折射的限制得到了改善
Improved Constraints on Cosmic Birefringence from the WMAP and Planck Cosmic Microwave Background Polarization Data
论文作者
论文摘要
观察到的宇宙微波背景（CMB）光子的线性极化模式是对物理违反平均坐标反转的均衡对称性的敏感探针。随着CMB光子已经运行超过130亿年，新的平均侵略性相互作用可能使线性极化平面旋转了一个角度$β$。这种效果被称为“宇宙双折射”。在本文中，我们通过对两个空间任务Planck和WMAP的极化数据的联合分析进行了对宇宙双折射的新测量。该数据集涵盖了从23到353 GHz的广泛频率。我们测量$β= 0.342^{\ circ \，+0.094^\ circ} _ {\ phantom {\ circ \，} - 0.091^\ circ} $（68％c.l.），用于几乎全天的数据，不包括$β= 0 $β= 0 $ at 99.987％c.l。这对应于$3.6σ$的统计意义。没有证据表明$β$的频率依赖性。从分析中去除银河面时，我们发现了类似的结果，尽管存在较大的不确定性。
The observed pattern of linear polarization of the cosmic microwave background (CMB) photons is a sensitive probe of physics violating parity symmetry under inversion of spatial coordinates. A new parity-violating interaction might have rotated the plane of linear polarization by an angle $β$ as the CMB photons have been traveling for more than 13 billion years. This effect is known as "cosmic birefringence." In this paper, we present new measurements of cosmic birefringence from a joint analysis of polarization data from two space missions, Planck and WMAP. This dataset covers a wide range of frequencies from 23 to 353 GHz. We measure $β= 0.342^{\circ\,+0.094^\circ}_{\phantom{\circ\,}-0.091^\circ}$ (68% C.L.) for nearly full-sky data, which excludes $β=0$ at 99.987% C.L. This corresponds to the statistical significance of $3.6σ$. There is no evidence for frequency dependence of $β$. We find a similar result, albeit with a larger uncertainty, when removing the Galactic plane from the analysis.
