Journal
PHYSICS LETTERS B
Volume 482, Issue 1-3, Pages 134-140Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0370-2693(00)00522-0
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Working on the approximation of low frequency, we present the light cone conditions for a class of theories constructed with the two gauge invariants of the Maxwell field without making use of average over polarization states. Different polarization states are thus identified describing birefringence phenomena. We make an application of the formalism to the case of Euler-Heisenberg effective Lagrangian and well know results are obtained. (C) 2000 Elsevier Science B.V. All rights reserved.
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