Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1999-07-05
Phys.Rev.E68:066501,2003
Physics
Nuclear Physics
Nuclear Theory
9 pages, 6 figures
Scientific paper
10.1103/PhysRevE.68.066501
We analyze the Vavilov-Cherenkov radiation (VCR) in a dispersive nontransparent dielectric air-like medium both below and above the Cherenkov threshold, in the framework of classical electrodynamics. It is shown that the transition to the subthreshold energies leads to the destruction of electromagnetic shock waves and to the sharp reduction of the frequency domain where VCR is emitted. The fine wake-like structure of the Vavilov-Cherenkov radiation survives and manifests the existence of the subthreshold radiation in the domain of anomalous dispersion. These domains can approximately be defined by the two phenomenological parameters of the medium, namely, the effective frequency of oscillators and the damping describing an interaction with the other degrees of freedom.
Afanasiev G. N.
Greiner Walter
Kartavenko V. G.
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