A data-driven method calibrates relative CMB polarization angles via cross-correlations without assuming zero isotropic birefringence or primordial EB, forecasting 0.10° and 0.17° uncertainties for SO LAT and Planck at 145 GHz if SO SATs reach 0.08°.
Galitzkiet al.(SO), The Simons Observatory: De- sign, Integration, and Testing of the Small Aper- ture Telescopes, Astrophys
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Calibration of CMB Polarisation Using Cross-Experiment Correlations
A data-driven method calibrates relative CMB polarization angles via cross-correlations without assuming zero isotropic birefringence or primordial EB, forecasting 0.10° and 0.17° uncertainties for SO LAT and Planck at 145 GHz if SO SATs reach 0.08°.