Volume 507 -
3rd General Meeting of the COST Action COSMIC WISPers (CA21106) - 3rd Training School of the COST Action COSMIC WISPers (CA21106)
(COSMICWISPers2025) -
WG2 parallel
Constraining ALPs with Cosmic Microwave Background Polarization Birefringence
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Pre-published on:
February 10, 2026
Published on:
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Abstract
Cosmic birefringence - the frequency-independent rotation of the linear polarization plane - offers a powerful probe of photon interactions with axion-like particles (ALPs). Its accurate characterization requires resolving two opposite conventions for the linear polarization angle. Here we summarize the latest data on the isotropic effect from cosmic microwave background (CMB) observations.
DOI: https://doi.org/10.22323/1.507.0016
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Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.