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Radiation Propagation and Confinement in a Medium: A Gauge Invariant Mechanism of Mass Generation

The propagation and the confinement of a radiation signal in a medium with the refractive index, n, is discussed. It is shown that formally the confinement occurs when n → 0, ∞. Specifically in the case of the n = 0 medium, which is readily offered by the collisionless isotropic electron plasma, it is shown that the radiation signal becomes a confined vector-like boson. In this connection it is pointed out that the radiation confinement phenomenon in the n = 0 medium is conceptually the same as the confinement phenomenon in QCD with a perfect dielectric vacuum.