Lorentz-violating electrodynamics and the cosmic microwave background
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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.
4 pages two-column REVTeX, accepted in Physical Review Letters
4 pages two-column REVTeX, accepted in Physical Review Letters