Lorentz-violating electrodynamics and the cosmic microwave background

Possible Lorentz-violating effects in the cosmic microwave background are studied. We provide a systematic classification of renormalizable and nonrenormalizable operators for Lorentz violation in electrodynamics and use polarimetric observations to search for the associated violations.

98.70.Vc
11.30.Cp
12.20.-m
cosmic background radiation
violation: Lorentz
operator: renormalizable
operator: nonrenormalizable
cosmic radiation: polarization
numerical calculations

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