Negative optical refractive index resulting from a moving regular medium
arXiv:physics/0312064
Abstract
The optical refractive index of a moving regular medium is calculated by using the Lorentz transformation in this note. It is shown that in some velocity region of medium moving relative to the initial frame K, the moving medium may possess a negative index of refraction measured by the observer fixed at the frame of reference K.
2 pages, Larex