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Paper   IPM / Astronomy / 8985
School of Astronomy
  Title:   Raychaudhuri equation in quantum gravitational optics
1.  N. Ahmadi
2.  M. Nouri-Zonoz
  Status:   Published
  Journal: PRAMANA J. Phys.
  No.:  1
  Vol.:  69
  Year:  2007
  Pages:   147-157
  Publisher(s):   Indian Academy of Sciences
  Supported by:  IPM
The equation of Raychaudri is one of the key concepts in the formulation of the singularity theorems introduced by Penrose and Hawking. In the present article, taking into account QED vacuum polarization, we study the propagation of a bundle of rays in a background gravitational field through the perturbative deformation of Raychaudhuri's equation. In a sense, this could be seen as another semiclassical study in which geometry is treated classically but matter (which means the photon here) is allowed to exhibit quantum characteristics that are encoded in its coupling to the background curvature.

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