Gravity-induced birefringence within the framework of Poincare gauge theory

  title={Gravity-induced birefringence within the framework of Poincare gauge theory},
  author={Oliver Preuss and Sami K. Solanki and Mark Haugan and S. Jordan},
  journal={Physical Review D},
Gauge theories of gravity provide an elegant and promising extension of general relativity. In this paper we show that the Poincare gauge theory exhibits gravity-induced birefringence under the assumption of a specific gauge invariant nonminimal coupling between torsion and Maxwell's field. Furthermore we give for the first time an explicit expression for the induced phase shift between two orthogonal polarization modes within the Poincare framework. Since such a phase shift can lead to a… 
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