Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2010-02-09
Phys.Rev.D81:125008,2010
Physics
High Energy Physics
High Energy Physics - Theory
30 pages, 1 figure, 57 equations, reference list of 38 items
Scientific paper
10.1103/PhysRevD.81.125008
The photon behavior in an arbitrary superposition of constant magnetic and electric fields is considered on most general grounds basing on the first principles like Lorentz- gauge- charge- and parity-invariance. We make model- and approximation-independent, but still rather informative, statements about the behavior that the requirement of causal propagation prescribes to massive and massless branches of dispersion curves, and describe the way the eigenmodes are polarized. We find, as a consequence of Hermiticity in the transparency domain, that adding a smaller electric field to a strong magnetic field in parallel to the latter causes enhancement of birefringence. We find the magnetic field produced by a point electric charge far from it (a manifestation of magneto-electric phenomenon). We establish degeneracies of the polarization tensor that (under special kinematic conditions) occur due to space-time symmetries of the vacuum left after the external field is imposed.
Shabad Anatoly E.
Usov Vladimir V.
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