Cosmic Microwave Background Delensing Revisited: Residual Biases and a Simple Fix

Wei-Hsiang Teng, Chao-Lin Kuo, Jiun-Huei Proty Wu

The delensing procedure is an effective tool for removing lensing-induced $B$-mode polarization in the Cosmic Microwave Background to allow for deep searches of primordial $B$-mode…