The problem of photon linear momentum in a refracting medium is discussed. It is shown that the relations P = k and ΔM = E/c2 cannot hold simultaneously in a refracting medium and that in the particular case of a negative-refraction medium, light pressure is replaced by light attraction. It is also shown that the Abraham energy–momentum tensor is actually not a tensor because of its lack of relativistic invariance.
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V. G. Veselago (2009) studied this question.
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