论文标题
限制宇宙极化旋转及其对原始B模型的影响
Constraining cosmic polarization rotation and implications for primordial B-modes
论文作者
论文摘要
宇宙双歧性（CB）是一种现象，是由于违反对电动力学的修改而引起的，因此光的线性极化角会随着光子的横穿真空而变化。可以使用许多不同的分析技术使用宇宙微波背景（CMB）极化观测来限制这种效果。我们研究了两种不同的方法，用于限制方向依赖性双折射，以进行当前和未来的CMB实验，包括二头肌/凯克，西蒙斯天文台（SO）和litebird。具体而言，我们将各向异性CB的约束从二次估计器技术与从三个不同实验的$ b $ mmode Power-spectrum估算得出的约束。发现从$ b $ mode功率谱的估计值中得出的约束与二头肌/凯克的二次估计量相媲美，但由于其较大的天空覆盖范围而不是Litebird。这些CB的预测上限被转换为原始磁场的约束以及光子和伪Nambu-Goldstone玻色子之间的耦合。最后，我们表明，即使对CB的最佳限制，对于各自的实验，可能引起的$ B $ mmode功率也可以作为预期测量原始$ B $ modes的重要污染物。
Cosmological Birefringence (CB) is a phenomenon, caused by parity violating modifications to electrodynamics, whereby the linear polarisation angle of light changes as photons traverse a vacuum. It is possible to use a number of different analysis techniques to constrain this effect using Cosmic Microwave Background (CMB) polarisation observations. We investigate two different methods of constraining direction dependent birefringence for present and future CMB experiments including BICEP/Keck, Simons Observatory (SO), and LiteBIRD . Specifically we compare the constraints placed on anisotropic CB from a quadratic estimator technique to those derived from estimates of the $B$-mode power-spectrum for the three different experiments. The constraints derived from estimates of the $B$-mode power spectrum are found to be comparable to those derived from quadratic estimator for BICEP/Keck and SO, but not LiteBIRD due to its larger sky coverage. These forecasted upper bounds for CB are converted to constraints on primordial magnetic fields and the coupling between photons and pseudo Nambu-Goldstone bosons. Finally we show that even with the best constraints on CB, for the respective experiments, the potentially induced $B$-mode power can act as a significant contaminant in the prospective measurement of primordial $B$-modes.
