Causal Structure and Birefringence in Nonlinear Electrodynamics

Published 2 Jul 2014 in hep-th, gr-qc, hep-ph, math-ph, and math.MP | (1407.0567v2)

Abstract: We investigate the causal structure of general nonlinear electrodynamics and determine which Lagrangians generate an effective metric conformal to Minkowski. We also proof that there is only one analytic nonlinear electrodynamics presenting no birefringence.

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