242 citations · 2.4k across the 70 of their papers we have counts for
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Multiloop Feynman Integrals in the Worldline Approach
Michael G. Schmidt, Christian Schubert
We explain the concept of worldline Green functions on classes of multiloop graphs. The QED beta function and the 2-loop Euler-Heisenberg Lagrangian are discussed for illustration.
Relativistic QFTH - Couplings on the Worldline
Michael G. Schmidt, Christian Schubert
In the framework of the worldline path integral approach to QFTH we discuss spin and relativistic couplings, in particular Yukawa and axial couplings to spin 1/2, and the case of s…
Constant External Fields in Gauge Theory and the Spin 0, 1/2, 1 Path Integrals
Martin Reuter, Michael G. Schmidt, Christian Schubert
We investigate the usefulness of the "string-inspired technique" for gauge theory calculations in a constant external field background. Our approach is based on Strassler's worldli…
Three Applications of the String-Inspired Technique to Quantum Electrodynamics
Denny Fliegner, Michael G. Schmidt, Christian Schubert
We discuss the following recent applications of the ``string-inspired'' worldline technique to calculations in quantum electrodynamics: i) Photon splitting in a constant magnetic f…