Polarization operator for plane-wave background fields
High Energy Physics - Phenomenology
2015-03-20 v2
Abstract
We derive an alternative representation of the leading-order contribution to the polarization operator in strong-field quantum electrodynamics with a plane-wave electromagnetic background field, which is manifestly symmetric with respect to the external photon momenta. Our derivation is based on a direct evaluation of the corresponding Feynman diagram, using the Volkov representation of the dressed fermion propagator. Furthermore, the validity of the Ward-Takahashi identity is shown for general loop diagrams in an external plane-wave background field.
Cite
@article{arxiv.1304.7672,
title = {Polarization operator for plane-wave background fields},
author = {S. Meuren and C. H. Keitel and A. Di Piazza},
journal= {arXiv preprint arXiv:1304.7672},
year = {2015}
}
Comments
20 pages, 2 figures