an:06802960
Zbl 1373.81402
Edwards, James P.; Schubert, Christian
One-particle reducible contribution to the one-loop scalar propagator in a constant field
EN
Nucl. Phys., B 923, 339-349 (2017).
00371645
2017
j
81V10 78A25
Summary: Recently, Gies and Karbstein showed that the two-loop Euler-Heisenberg Lagrangian receives a finite one-particle reducible contribution in addition to the well-known one-particle irreducible one. Here, we demonstrate that a similar contribution exists for the propagator in a constant field already at the one-loop level, and we calculate this contribution for the scalar QED case. We also present an independent derivation of the Gies-Karbstein result using the worldline formalism, treating the scalar and spinor QED cases in a unified manner.