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°.
de la Hozet al.(LiteBIRD), LiteBIRD science goals and forecasts: constraining isotropic cosmic birefrin- gence, JCAP07, 083, arXiv:2503.22322 [astro-ph.CO]
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A new map-based hybrid E-B ILC estimator disentangles cosmic birefringence from miscalibration effects and measures β ≈ 0.32° ± 0.12° on Planck PR4 data.
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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°.
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Field-level constraints on cosmic birefringence with a hybrid $E$-$B$ internal linear combination
A new map-based hybrid E-B ILC estimator disentangles cosmic birefringence from miscalibration effects and measures β ≈ 0.32° ± 0.12° on Planck PR4 data.