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[en] We propose an essentially nonperturbative procedure to renormalize a v4 theory, in the framework of the Migdal approximation. A Jensen-type inequality provides a further tool to get some insights about the critical behavior of such a theory in the weak- as well as in the strong-coupling limit. We stress that for d> or =4 the theory has no nontrivial fixed points. The comparison of our results with those obtained by the Wilson e expansion provides an encouraging confirmation of the correctness of our approximation
Journal
Physical Review. D, Particles Fields; ISSN 0556-2821; 
; v. 23(10); p. 2252-2261
; v. 23(10); p. 2252-2261