Towards ending the partial sky E-B ambiguity in CMB observations

Understand

A crucial problem for partial sky analysis of CMB polarization is the $E$-$B$ leakage problem.

• Such leakage arises from the presence of `ambiguous' modes that satisfy properties of both $E$ and $B$ modes.
• Solving this problem is critical for primordial polarization $B$ mode detection in partial sky CMB polarization experiments.
• In this work we introduce a new method for reducing the leakage.