G. Keller et C. Kopper, PERTURBATIVE RENORMALIZATION OF MASSLESS PHI-4(4) WITH FLOW EQUATIONS, Communications in Mathematical Physics, 161(3), 1994, pp. 515-532
Perturbative renormalizability proofs in the Wilson-Polchinski renorma
lization group framework, based on flow equations, were so far restric
ted to massive theories. Here we extend them to Euclidean massless phi
4(4). As a by-product of the proof we obtain bounds on the singularity
of the Green functions at exceptional momenta in terms of the excepti
onality of the latter. These bounds seem to be new and are quite sharp
.