Effective theory of soft photons in slowly varying electromagnetic background fields is studied at one-loop order in QED. This is of relevance for the study of all-optical signatures of quantum vacuum nonlinearity in realistic electromagnetic background fields as provided by high-intensity lasers. The central result derived in this article is a new analytical expression for the photon polarization tensor in two linearly polarized counterpropagating pulsed Gaussian laser beams. Treating the peak field strengths of both laser beams as free parameters, this field configuration can be considered as interpolating between the limiting cases of a purely right- or left-moving laser beam (if one of the peak field strengths is set equal to zero) and the standing-wave type scenario with two counter-propagating beams of equal strength.
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Translated from Izvestiya Vysshikh Uchebhykh Zavedenii, Fizika, No. 11, pp. 35–39, November, 2016.
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Karbstein, F. Photon Propagation in Slowly Varying Electromagnetic Fields. Russ Phys J 59, 1761–1767 (2017). https://doi.org/10.1007/s11182-017-0974-1
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DOI: https://doi.org/10.1007/s11182-017-0974-1