Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1995-11-20
Int.J.Mod.Phys. A12 (1997) 4461-4476
Physics
High Energy Physics
High Energy Physics - Theory
32 pages, latex-file, no figures
Scientific paper
10.1142/S0217751X97002437
We present some generalizations of a recently proposed alternative approach to nonabelian gauge theories based on the causal Epstein-Glaser method in perturbative quantum field theory. Nonabelian gauge invariance is defined by a simple commutator relation in every order of perturbation theory separately using only the linear (abelian) BRS-transformations of the asymptotic fields. This condition is sufficient for the unitarity of the S-matrix in the physical subspace. We derive the most general specific coupling compatible with the conditions of nonabelian gauge invariance and normalizability. We explicitly show that the quadrilinear terms, the four-gluon-coupling and the four-ghost-coupling, are generated by our linear condition of nonabelian gauge invariance. Moreover, we work out the required generalizations for linear gauges.
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