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- W2890910277 abstract "The electromagnetic theory is, to a large extend, metric independent. Before the metric is introduced, it is called premetric electrodynamics. Metric enters the constitutive relation. We consider this relation for the Friedman model of an expanding Universe and find that the magnitudes of the field quantities depend on the scale factor. This factor, however, does not enter the permeability and permittivity of the vacuum. A spatially uniform electromagnetic field is obtained for spatially flat metric. Then plane electromagnetic wave is found with uniform field playing the role of amplitudes. It turns out that the magnitudes of the frequency and the wave covector depend on the scale factor determining the redshift, but the phase velocity of the wave is constant." @default.
- W2890910277 created "2018-09-27" @default.
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- W2890910277 date "2019-05-01" @default.
- W2890910277 modified "2023-09-27" @default.
- W2890910277 title "Plane electromagnetic wave in spatially flat Friedman universe" @default.
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- W2890910277 doi "https://doi.org/10.1063/1.5058731" @default.
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