Lorentz-violating electrodynamics and the cosmic microwave background.

@article{Kosteleck2007LorentzviolatingEA,
  title={Lorentz-violating electrodynamics and the cosmic microwave background.},
  author={V. Alan Kosteleck{\'y} and Matthew Mewes},
  journal={Physical review letters},
  year={2007},
  volume={99 1},
  pages={
          011601
        }
}
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. 

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