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Energy–momentum conservation in pre-metric electrodynamics with magnetic charges

Gerald Kaiser

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A 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 oastz 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.


PACS

03.50.De Classical electromagnetism, Maxwell equations

02.30.Jr Partial differential equations

41.20.Jb Electromagnetic wave propagation; radiowave propagation

02.30.Em Potential theory

MSC

35Q60 Equations of electromagnetic theory and optics

53B30 Lorentz metrics, indefinite metrics

Subjects

Mathematical physics

Accelerators, beams and electromagnetism

Particle physics and field theory

Dates

Issue 28 (16 July 2004)

Received 13 April 2004, in final form 22 May 2004

Published 30 June 2004



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