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Negative refraction in outer space?

Tom G. Mackay, Akhlesh Lakhtakia

physics.opticsarXiv:physics/0405103

Abstract

Mediums which do not support the propagation of plane waves with negative phase velocity (NPV) when viewed at rest can support NPV propagation when they are viewed in a reference frame which is uniformly translated at sufficiently high velocity. Thus, relativistic negative refraction may be exploited in astronomical scenarios.

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