Scharnhorst effect at oblique incidence

@article{Liberati2000ScharnhorstEA,
  title={Scharnhorst effect at oblique incidence},
  author={Stefano Liberati and Sebastiano Sonego and Matt Visser},
  journal={Physical Review D},
  year={2000},
  volume={63},
  pages={085003}
}
We consider the Scharnhorst effect (anomalous photon propagation in the Casimir vacuum) at oblique incidence, calculating both photon speed and polarization states as functions of angle. The analysis is performed in the framework of nonlinear electrodynamics and we show that many features of the situation can be extracted solely on the basis of symmetry considerations. Although birefringence is common in nonlinear electrodynamics it is not universal; in particular we verify that the Casimir… 

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