Electromagnetism with dimension-five operators
arXiv:1409.6867 · doi:10.1103/PhysRevD.90.105014
Abstract
We derive, in curved spacetime, the most general Lorentz-violating electromagnetic Lagrangian containing dimension-five operators with one more derivative than the Maxwell term in the hypothesis that Lorentz symmetry is broken by a background four-vector . We then study, for the case of isotropic , the generation of cosmic magnetic fields at inflation and cosmic birefringence. In the limiting case of Minkowski spacetime, we find that other than the CPT-odd Myers-Pospelov term, there exists another CPT-odd term that gives rise to nontrivial dispersion and constitutive relations.
7 pages, no figures, typos corrected, version matching the published one in Physical Review D
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