2002/07/09 by Oliver Schröder, Oliver Schroeder, Hugo Reinhardt · 1 citation
Physics and Astronomy · #Magnetic confinement fusion research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1016/j.aop.2004.03.007
published as Annals Phys. 312 (2004) 319-353 · 26 pages, REVTeX4, uses amsfonts and package longtable
arxiv created 2002/07/09 · openalex publication_date 2004/05/11 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
In Yang-Mills theories, variational calculations of the Rayleigh-Ritz type face the problem that on the one hand, calculability puts severe constraints on the space of test wave functionals; on the other hand, the test wave functionals have to be gauge invariant. The conflict between the two requirements can be resolved by introducing a projector. In this paper we present an approach to approximating the projector in a way known and successfully employed in nuclear physics: the Kamlah expansion. We discuss it both for electrodynamics and for Yang-Mills theories to leading order in a perturbative expansion, and demonstrate that the results are compatible with what one would expect from perturbation theory.