paper

Planck constraints on cross-correlations between anisotropic cosmic birefringence and CMB polarization

arXiv:2206.01635 · doi:10.1088/1475-7516/2022/09/075

Abstract

Cosmic Birefringence (CB) is the in-vacuo rotation of the linear polarization direction of photons during propagation, caused by parity-violating extensions of Maxwell electromagnetism. We build low resolution CB angle maps using Planck Legacy and NPIPE products and provide for the first time estimates of the cross-correlation spectra and between the CB and the CMB polarization fields. We also provide updated CB auto-correlation spectra as well as the cross-correlation with the CMB temperature field. We report constraints by defining the scale-invariant amplitudes , where , finding no evidence of CB. In particular, we find nK deg and nK deg at 68% C.L..

24 pages, 14 figures. Accepted for publication in JCAP

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