Determination of Polarization Angles in CMB Experiments and Application to CMB Component Separation Analyses

Understand

The new generation of CMB polarization experiments will reach limits of sensitivity never achieved before to detect the primordial B-mode signal.

• However, all these efforts will be futile if we lack a tight control of systematics.
• Here, we focus on the systematic that arises from the uncertainty on the calibration of polarization angles.
• Miscalibrated polarization angles induce a mixing of E- and B-modes that obscures the primordial B-mode signal.