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hep-th1996
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.
hep-th1996
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…