Global and local perspectives of gravitationally assisted negative-phase-velocity propagation of electromagnetic waves in vacuum

Details Global and local perspectives of gravitationally assisted negative-phase-velocity propagation of electromagnetic waves in vacuum Global and local perspectives of gravitationally assisted negative-phase-velocity propagation of electromagnetic waves in vacuum

2004-09-30

arxiv.org/abs/physics/0409159v4

Phys.Lett. A335 (2005) 89-96

Physics

Classical Physics

Scientific paper

10.1016/j.physleta.2005.01.014

Consistently with the Einstein equivalence principle and using an electromagnetic formulation first suggested by Tamm, we show that a local observer cannot observe negative-phase-velocity (NPV) propagation of electromagnetic waves in vacuum, whereas a global observer can appreciate that phenomenon. Using the specific example of the Kerr metric, we also demonstrate the possibility of NPV propagation within the ergosphere of a rotating black hole.

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