# 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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