Constraints on cosmic birefringence using -mode polarisation
arXiv:2203.10733 · doi:10.1088/1475-7516/2022/08/033
Abstract
A birefringent universe could show itself through a rotation of the plane of polarisation of the cosmic microwave background photons. This is usually investigated using polarisation modes, which is degenerate with miscalibration of the orientation of the polarimeters. Here we point out an independent method for extracting the birefringence angle using only temperature and -mode signals. We forecast that, with an ideal cosmic-variance-limited experiment, we could constrain a birefringence angle of with statistical significance, which is close to the current constraints using modes. We explore how this method is affected by the systematic errors introduced by the polarisation efficiency. In the future, this could provide an additional way of checking any claimed -mode derived birefringence signature.
arXiv comment11 pages
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