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- W2534853220 abstract "Any practical application of the Schwinger-Dyson equations to the study of $n$-point Green's functions of a field theory requires truncations, the best known being finite order perturbation theory. Strong coupling studies require a different approach. In the case of QED, gauge covariance is a powerful constraint. By using a spectral representation for the massive fermion propagator in QED, we are able to show that the constraints imposed by the Landau-Khalatnikov-Fradkin transformations are linear operations on the spectral densities. Here we formally define these group operations and show with a couple of examples how in practice they provide a straightforward way to test the gauge covariance of any viable truncation of the Schwinger-Dyson equation for the fermion 2-point function." @default.
- W2534853220 created "2016-10-28" @default.
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- W2534853220 date "2017-06-01" @default.
- W2534853220 modified "2023-09-27" @default.
- W2534853220 title "Gauge covariance of the fermion Schwinger–Dyson equation in QED" @default.
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- W2534853220 doi "https://doi.org/10.1016/j.physletb.2017.03.032" @default.
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