Gerald Kaiser 2004 J. Phys. A: Math. Gen. 37 7163 doi:10.1088/0305-4470/37/28/007
Gerald Kaiser
Show affiliationsA necessary and sufficient condition for energy-momentum conservation is proved within a topological, pre-metric approach to classical electrodynamics including magnetic as well as electric charges. The extended Lorentz force, consisting of mutual actions by F ~ (E, B) on the electric current and G ~ (H, D) on the magnetic current, can be derived from an energy-momentum 'potential' if and only if the constitutive relation G = G(F) satisfies a certain vanishing condition. The electric-magnetic reciprocity introduced by Hehl and Obukhov is shown to define a one-parameter family
z of complex structures on the product space of 2-form pairs (F, G), independent of any spacetime metric, which reduces to the product of two Hodge star operators once a Lorentzian metric is introduced. In contrast to a recent claim made in the literature, it does not define a complex structure on the space of 2-forms itself.
03.50.De Classical electromagnetism, Maxwell equations
02.30.Jr Partial differential equations
41.20.Jb Electromagnetic wave propagation; radiowave propagation
Issue 28 (16 July 2004)
Received 13 April 2004, in final form 22 May 2004
Published 30 June 2004
Gerald Kaiser 2004 J. Phys. A: Math. Gen. 37 7163
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