An Introduction to the Worldline Technique for Quantum Field Theory Calculations

Abstract

These two lectures give a pedagogical introduction to the ``string-inspired'' worldline technique for perturbative calculations in quantum field theory. This includes an overview over the present range of its applications. Several examples are calculated in detail, up to the three-loop level. The emphasis is on photon scattering in quantum electrodynamics.

arXiv comment33 pages, 10 figures, Latex, uses din_a4, epsf and epsfig, Lectures given at XXXVI Cracow School of Theoretical Physics Zakopane 1996, minor corrections