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Planck constraints on cosmic birefringence and its cross-correlation with the CMB

Zagatti, G., Bortolami, M., Gruppuso, A., Natoli, P., Pagano, L. and Fabbian, G. ORCID: 2024. Planck constraints on cosmic birefringence and its cross-correlation with the CMB. Journal of Cosmology and Astroparticle Physics 2024 (05) , 034. 10.1088/1475-7516/2024/05/034

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Cosmic birefringence is the in-vacuo, frequency independent rotation of the polarization plane of linearly polarized radiation, induced by a parity-violating term in the electromagnetic Lagrangian. We implement a harmonic estimator for the birefringence field that only relies on the CMB E to B mode cross-correlation, thus suppressing the effect of cosmic variance from the temperature field. We derive constraints from Planck public releases 3 and 4, revealing a cosmic birefringence power spectrum consistent with zero at about 2σ up to multipole L = 1500. Moreover, we find that the cross-correlations of cosmic birefringence with the CMB T-, E- and B-fields are also well compatible with null. The latter two cross-correlations are provided here for the first time up to L = 1500.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Physics and Astronomy
Additional Information: License information from Publisher: LICENSE 1: URL:, Type: cc-by
Publisher: IOP Publishing
Date of First Compliant Deposit: 7 May 2024
Date of Acceptance: 26 March 2024
Last Modified: 07 May 2024 08:45

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