ar X iv : h ep - t h / 02 10 00 9 v 1 1 O ct 2 00 2 1 ERG AS A TOOL FOR NON - PERTURBATIVE STUDIES 1


To see the role of the exact renormalization group approach let us consider a situation which is rather common in quantum field theory. Suppose that there is a fundamental theory with the action SΛ0 [φ] defined at some energy scale Λ0, and suppose that we are interested in physical effects described by such theory at energies of order Λ ≪ Λ0. One way to… (More)


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