Feynman-Schwinger technique in field theories

Details Feynman-Schwinger technique in field theories Feynman-Schwinger technique in field theories

2000-11-20

arxiv.org/abs/hep-ph/0011249v1

Czech.J.Phys. 51 (2001) B71-B102

Physics

High Energy Physics

High Energy Physics - Phenomenology

Lectures given at the 13th Indian-Summer School on Intermediate Energy Physics, {\em Understanding the Structure of Hadrons},

Scientific paper

10.1007/s10582-001-0049-x

In these lectures we introduce the Feynman-Schwinger representation method for solving nonperturbative problems in field theory. As an introduction we first give a brief overview of integral equations and path integral methods for solving nonperturbative problems. Then we discuss the Feynman-Schwinger (FSR) representation method with applications to scalar interactions. The FSR approach is a continuum path integral integral approach in terms of covariant trajectories of particles. Using the exact results provided by the FSR approach we test the reliability of commonly used approximations for nonperturbative summation of interactions for few body systems.

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