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Probing Lorentz-violating electrodynamics with CMB polarization

Caloni, L., Giardiello, Serena, Lembo, M., Gerbino, M., Gubitosi, G., Lattanzi, M. and Pagano, L. 2023. Probing Lorentz-violating electrodynamics with CMB polarization. Journal of Cosmology and Astroparticle Physics 2023 (03) , 018. 10.1088/1475-7516/2023/03/018

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We perform a comprehensive study of the signatures of Lorentz violation in electrodynamics on the Cosmic Microwave Background (CMB) anisotropies. In the framework of the minimal Standard Model Extension (SME), we consider effects generated by renormalizable operators, both CPT-odd and CPT-even. These operators are responsible for sourcing, respectively, cosmic birefringence and circular polarization. We propagate jointly the effects of all the relevant Lorentz-violating parameters to CMB observables and provide constraints with the most recent CMB datasets. We bound the CPT-even coefficient to kF,E+B < 2.31 × 10-31 at 95% CL. This improves previous CMB bounds by one order of magnitude. The limits we obtain on the CPT-odd coefficients, i.e. |k (3) (V)00| < 1.54 × 10-44 GeV and |kAF | < 0.74 × 10-44 GeV at 95% CL, are respectively one and two orders of magnitude stronger than previous CMB-based limits, superseding also bounds from non-CMB searches. This analysis provides the strongest constraints to date on CPT-violating coefficients in the minimal SME from CMB searches.

Item Type: Article
Date Type: Publication
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: 8 March 2023
Date of Acceptance: 13 February 2023
Last Modified: 01 Jun 2023 19:24

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