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Paper   IPM / P / 8411
School of Physics
  Title:   Fermat's Principle in Quantum Gravitational Optics
1.  N. Ahmadi
2.  S. Khoeini-Moghaddam
3.  M. Nouri-Zonoz
  Status:   Published
  Journal: JCAP
  Vol.:  05
  Year:  2008
  Pages:   015
  Supported by:  IPM
Interactions incorporating the vacuum polarization effects in curved backgrounds modify the null cone structure in such a way that the photon trajectories would not be the spacetime geodesics anymore. The gravitational birefringence introduced as a direct consequence of these effects, will allow shifts in the photon velocities leading to polarization dependent superluminal propagation. Taking these effects into account we study Fermat's principle in the context of the 1+3 (threading) formulation of the spacetime decomposition. Then, as an application of the above ideas, photon velocity shifts in the case of the NUT space as the background gravitational field are calculated.

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