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.

中文翻译：

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偏振银河前景发射对 CMB 透镜重建和 B 模式去透镜的影响

下一代 CMB 实验，如 CMB-S4，旨在以亚百分比精度测量 CMB 透镜潜力，其中大部分约束力将来自 CMB 极化。我们通过使用非高斯天空模拟并利用多频信息来清理这些，研究了在存在大规模漫反射星系前景发射的情况下实现这一目标的前景。我们表明，虽然在前景清洁之前，来自受污染透镜电位估计的宇宙学参数估计可能存在显着偏差，但可以通过应用参数化前景清洁方法成功地减轻这些偏差。