Speaker
Dmitry Kazakov
(JINR)
Description
R-operation and locality of QFT guarantees locality of the counterterms in coordinate space or at most polinomiality in momentum space. This leads to relations between the counterterms in subsequent orders of perturbation theory. In its turn these relations allow one to get the recurrent relations which can be promoted to RG equations for the leading, subleading, etc logarithms. Remarkably that the RG equations in sub, subsub, etc orders are always linear differential ones.
The advocated formalism works equally well in renormalizable and non-renormalizable theories.
Different examples are presented.
Author
Dmitry Kazakov
(JINR)
