Quantum gravitational optics

  title={Quantum gravitational optics},
  author={Graham M. Shore},
  journal={Contemporary Physics},
  pages={503 - 521}
  • G. Shore
  • Published 15 April 2003
  • Physics
  • Contemporary Physics
In quantum theory, the curved spacetime of Einstein's general theory of relativity acts as a dispersive optical medium for the propagation of light. Gravitational rainbows and birefringence replace the classical picture of light rays mapping out the null geodesics of curved spacetime. Even more remarkably, superluminal propagation becomes a real possibility, raising the question of whether it is possible to send signals into the past. In this article, we review recent developments in the… 

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