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Simultaneous determination of the cosmic birefringence and miscalibrated polarization angles II: Including cross frequency spectra
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abstract
We develop a strategy to determine the cosmic birefringence and miscalibrated polarization angles simultaneously using the observed $EB$ polarization power spectra of the cosmic microwave background and the Galactic foreground emission. We extend the methodology of Y. Minami et al. (Prog. Theor. Exp. Phys. $\mathbf{2019}$, 083E02, 2019), which was developed for auto frequency power spectra, by including cross frequency spectra. By fitting one global birefringence angle and independent miscalibration angles at different frequency bands, we determine both angles with significantly smaller uncertainties (by more than a factor of two) compared to the auto spectra.
Forward citations
Cited by 5 Pith papers
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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 a...
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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.
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Planck constraints on the scale dependence of isotropic cosmic birefringence
Planck polarization data favor a constant cosmic birefringence angle (β≈0.3°) across multipoles, with scale dependence consistent with zero at up to 1.8σ.
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Simultaneous inference of isotropic and anisotropic polarization rotation angles for next-generation cosmic microwave background experiments
A Bayesian power-spectrum framework simultaneously infers isotropic and anisotropic cosmic birefringence angles, instrumental miscalibration angles, and foreground parameters from simulated multi-frequency next-genera...
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Cosmic Birefringence from the Atacama Cosmology Telescope Data Release 6
Bayesian analysis of ACT DR6 CMB polarization data measures cosmic birefringence angle β = 0.215° ± 0.074° excluding zero at 2.9σ, consistent with prior WMAP and Planck results but limited by unexplained systematics.
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