On linear electromagnetic constitutive laws that define almost-complex structures

Details On linear electromagnetic constitutive laws that define almost-complex structures On linear electromagnetic constitutive laws that define almost-complex structures

2006-10-08

arxiv.org/abs/gr-qc/0610031v1

Annalen Phys. 16 (2007) 207-217

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

14 pages, accepted by Annalen der Physik

Scientific paper

10.1002/andp.200610227

It is shown that not all linear electromagnetic constitutive laws will define almost-complex structure on the bundle of 2-forms on the spacetime manifold when composed with the Poincare duality isomorphism, but only a restricted class of them that includes linear spatially isotropic and some bi-isotropic laws. Although this does not trivialize the formulation of the basic equations equations of pre-metric electromagnetism, it does affect their reduction to metric electromagnetism by its effect on the types of media that are reducible, and possibly its effect on the way that such media support the propagation of electromagnetic waves.

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