Power counting degree versus singular order in the Schwinger model
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The importance of a rigorous definition of the singular degree of a distribution is demonstrated on the case of two-dimensional QED (Schwinger model). Correct mathematical treatment of second order vacuum polarization in the perturbative approach is crucial in order to obtain the Schwinger mass of the photon by resummation.
5 pages, LaTeX, no figures. To appear in Lett. Math. Phys
5 pages, LaTeX, no figures. To appear in Lett. Math. Phys