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VOLUME 28 (1978) | ISSUE 7 | PAGE 482
Photon momentum in a medium with negative group velocity
The applicability of the expression ρ = nfiay/c for the photon momentum in a refracting medium is discussed in cases of Cerenkov radiation and light refraction by the surface of a medium with negative group velocity (the photon in the medium is regarded as a quasiparticle). The photon momentum and the velocity of its motion are oppositely directed, corresponding to a negative mass of the quasiphoton. The pressure of the light in the medium with negative group velocity should be negative.