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Examination of equilibrium radiation in plasma media shows that the spectralthe energy distribution of such radiation is different from the Planckequilibrium radiation. Using the previously obtained general relations for thespectral energy density of equilibrium radiation in a system of chargedparticles, we consider radiation in an electron in the limiting case of aninfinitesimal damping. It is shown that zero vacuum fluctuations which are partof the full spectral energy distribution should be renormalized. In this case,the renormalized zero vacuum fluctuations depend on the electron density. Asimilar effect should exist in the general case of a quasineutral plasma.

On equilibrium radiation and zero-point fluctuations in non-relativistic electron gas