论文标题
极化银河前景发射对CMB镜头重建和删除B模型的影响
Impact of Polarized Galactic Foreground Emission on CMB Lensing Reconstruction and Delensing of B-Modes
论文作者
论文摘要
下一代CMB实验（例如CMB-S4）旨在测量次级精度的CMB镜头潜力，而大多数约束功率将来自CMB极化。我们通过使用非高斯天空模拟并利用多频率信息来清洁这些目标，研究了在存在大规模弥漫的银河前景排放中实现这一目标的前景。我们表明，虽然在前景清洁之前，但从受污染的镜头势估计中估计估计可以显着偏见，但可以通过采用参数前景清洁方法来成功缓解这些估计。我们进一步观察到在施加前景清洁后，在删除的B模式功率谱上没有明显的额外偏差，因此能够在删除后对张量与尺度比率（$ r $ $ r $）获得无偏的测量。
Next generation CMB experiments such as CMB-S4 aim at measuring the CMB lensing potential at sub-percent precision where most of the constraining power will come from CMB polarization. We investigate the prospects of achieving this goal in the presence of large-scale, diffuse galactic foreground emission by using non-Gaussian sky simulations and exploit multi-frequency information to clean those. We show that, while prior to foreground cleaning, cosmological parameter estimates from the contaminated lensing potential estimation can be significantly biased, these can be successfully mitigated by applying a parametric foreground cleaning approach. We further observe no significant additional bias in the delensed B-mode power spectrum after applying foreground cleaning and are therefore able to obtain an unbiased measurement of the tensor-to-scalar ratio, $r$, after delensing.
