CPT conserving cosmological birefringence

@article{Geng2007CPTCC,
  title={CPT conserving cosmological birefringence},
  author={Chao-Qiang Geng and S. H. Ho and John N. Ng},
  journal={arXiv: Astrophysics},
  year={2007}
}
We demonstrate that the cosmological birefringence can arise from CPT conserving effect, originated from the CPT-even dimension-six Chern-Simons-like term. We show that a sizable rotation polarization angle in the data of the cosmic microwave background radiation polarization can be induced. 
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