用于下一代宇宙微波背景实验的各向同性和各向异性极化旋转角的同时推断
Simultaneous inference of isotropic and anisotropic polarization rotation angles for next-generation cosmic microwave background experiments
AI总结：
该研究针对下一代宇宙微波背景实验，建立综合模型，用贝叶斯分析同时推断各向同性和各向异性极化旋转角，可有效提取旋转效应，研究已知源影响，适合未来极化数据分析，或助于揭示轴子样粒子性质。
AI中文摘要：
宇宙微波背景（CMB）的超高灵敏度极化成像是新物理的宝库。寻找被称为宇宙双折射效应的预测极化角旋转是下一代CMB实验的追求，此新极化信号对测试基础物理理论很重要。但这种微妙的旋转效应会被包括极化银河系前景和仪器校准效应等不同机制混淆。此外，宇宙学旋转效应可能源于轴子样粒子的背景演化和空间波动，在CMB极化波动上留下复杂印记。在这项工作中，我们建立了宇宙学旋转效应、极化角的仪器校准错误和具有高阶波动的复杂前景极化的综合模型，并进行贝叶斯分析，以同时推断从亚毫米到毫米波长的前景减轻极化数据集的各向同性和各向异性旋转角。我们发现这种贝叶斯形式主义可以有效地为下一代CMB实验提取旋转效应，并研究包括银河系前景和透镜效应在内的已知源对推断的宇宙学信号的影响。这项工作中的方法非常适合未来的极化数据分析，推断出的旋转效应可能有助于揭示轴子样粒子的性质。
英文摘要：
The ultrahigh-sensitivity polarization imaging of the cosmic microwave background (CMB) is a treasure trove for new physics. Searching for a predicted polarization angle rotation known as the cosmic birefringence effect is a pursuit of the next-generation CMB experiments, and this new polarization signal would be important for testing fundamental physics theories. However, such a delicate rotation effect can be confused by different mechanisms including polarized Galactic foregrounds and instrumental calibration effects. Also, the cosmological rotation effects may arise from both the background evolution and spatial fluctuations of axion-like particles, leaving complicated imprints on CMB polarization fluctuations. In this work, we establish a comprehensive modeling of cosmological rotation effects, the instrumental miscalibration of polarization angles and complex foreground polarization with higher-order fluctuations, and perform a Bayesian analysis to infer both isotropic and anisotropic rotation angles simultaneously for foreground-mitigated polarization datasets from submillimeter to millimeter wavelengths. We find that such a Bayesian formalism can effectively extract the rotation effects for the next-generation CMB experiments and investigate the impact of the known sources including Galactic foregrounds and lensing on the inferred cosmological signals. The method in this work is well suited for future polarization data analyses, and the inferred rotation effects may shed light on the nature of the axion-like particles.
