paper

Light Propagation in Non-Trivial QED Vacua

arXiv:hep-ph/9804303 · doi:10.1016/S0370-2693(98)00572-3

Abstract

Within the geometric optics approximation, we derive the light cone condition for a class of homogeneous non-trivial QED vacua using the effective action approach. Our result generalizes the ``unified formula'' suggested by Latorre, Pascual and Tarrach which turns out to be a low-energy limit. We calculate the velocity shifts induced by electromagnetic fields and finite temperature and especially analyze the high-energy limit consistent with the loop approximation.

6 pages, REVTeX

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