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has been cited by the following article:

• TITLE: Relativistic-Covariant Energy-Momentum Tensor for Homogeneous Anisotropic Dispersive Media

  AUTHORS: Alfred Wünsche

  KEYWORDS: Spatial and Frequency Dispersion, Permittivity Tensor, Group Velocity, Cold Plasma, Coordinate-Invariant Methods, Lorentz Group, Lorentz Invariants

  JOURNAL NAME: Journal of Modern Physics, Vol.12 No.13, November 30, 2021

  ABSTRACT: A new relativistically covariant approach is discussed for the derivation of local conservation theorems for homogeneous anisotropic and, in particular, dispersive media. We start from a three-dimensional operator equation for the electric field and obtain mainly by coordinate-invariant methods the results basically expressed by the slowly varying amplitudes of the electric field. Apart from local energy and momentum conservation formulated by the energy-momentum conservation, we find a local conservation theorem for the action which is more general and which is the only one which remains also true for inhomogeneous media.