Faster than light' photons and charged black holes
arXiv:hep-th/9310114 · doi:10.1016/0550-3213(94)90291-7
Abstract
Photons propagating in curved spacetime may, depending on their direction and polarisation, have velocities exceeding the ``speed of light'' c. This phenomenon arises through vacuum polarisation in QED and is a tidal gravitational effect depending on the local curvature. It implies that the Principle of Equivalence does not hold for interacting quantum field theories in curved spacetime and reflects a quantum violation of local Lorentz invariance. These results are illustrated for the propagation of photons in the Reissner-Nordström spacetime characterising a charged black hole. A general analysis of electromagnetic as well as gravitational birefringence is presented.
arXiv comment17pages, SWAT 93-9, UGVA-DPT 1993/08-830 (includes three macros undefined in originally submitted version)
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