Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1993-01-27
Nucl.Phys. B409 (1993) 441-464
Physics
High Energy Physics
High Energy Physics - Theory
Latex file, 21 pages and 6 figures (included), Parma Univ. preprint UPRF-92-360
Scientific paper
10.1016/0550-3213(93)90588-G
A new proof of perturbative renormalizability and infrared finiteness for a scalar massless theory is obtained from a formulation of renormalized field theory based on the Wilson renormalization group. The loop expansion of the renormalized Green functions is deduced from the Polchinski equation of renormalization group. The resulting Feynman graphs are organized in such a way that the loop momenta are ordered. It is then possible to analyse their ultraviolet and infrared behaviours by iterative methods. The necessary subtractions and the corresponding counterterms are automatically generated in the process of fixing the physical conditions for the ``relevant'' vertices at the normalization point. The proof of perturbative renormalizability and infrared finiteness is simply based on dimensional arguments and does not require the usual analysis of topological properties of Feynman graphs.
Bonini Marco
D'Attanasio Marco
Marchesini Giuseppe
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