论文标题
普朗克对各向异性宇宙双折射与CMB极化之间的互相关的约束
Planck constraints on cross-correlations between anisotropic cosmic birefringence and CMB polarization
论文作者
论文摘要
宇宙双折射（CB）是由于麦克斯韦电磁剂的平价扩展引起的传播过程中光子线性极化方向的空中旋转。我们使用Planck Legacy和NPipe产品构建低分辨率CB角度图，并首次提供互相关光谱的估计$ C_L^{αe} $和$ C_L^{αB} $之间的CB和CMB偏置领域。我们还提供了更新的CB自动相关光谱$ C_L^{αα} $以及CMB温度场的互相关$ C_L^{αt} $。我们通过定义规模不变振幅来报告约束，$ a^{αx} \ equiv l（l + 1）c_l^{αx}/2π$，其中$ x =α，t，e，b $，没有找到CB的证据。特别是，我们发现$ a^{αe} =（-7.8 \ pm 5.6）$ nk deg和$ a^{αB} =（0.3 \ pm 4.0）$ nk deg在68％c.l ..
Cosmic Birefringence (CB) is the in-vacuo rotation of the linear polarization direction of photons during propagation, caused by parity-violating extensions of Maxwell electromagnetism. We build low resolution CB angle maps using Planck Legacy and NPIPE products and provide for the first time estimates of the cross-correlation spectra $C_L^{αE}$ and $C_L^{αB}$ between the CB and the CMB polarization fields. We also provide updated CB auto-correlation spectra $C_L^{αα}$ as well as the cross-correlation $C_L^{αT}$ with the CMB temperature field. We report constraints by defining the scale-invariant amplitudes $A^{αX} \equiv L(L + 1)C_L^{αX}/2π$, where $X = α, T, E, B$, finding no evidence of CB. In particular, we find $A^{αE} = (-7.8 \pm 5.6)$ nK deg and $A^{αB} = (0.3 \pm 4.0)$ nK deg at 68% C.L..
