While studying renormalization and the renonormalization group i felt that there wasn't any completely satisfying physical explanation that would justify those methods and the perfect results they get. Looking for some clarity i began to study Wilson's approach to renormalization; while i got a lot of insight on how a QFT works and what's the role of quantum fluctuations ecc i could not find a direct clear connection between the "standard" approach and the Wilson one. I'll try to be more specific:
To my understanding Wilson approach says (very) bascially this: given a quantum field theory defined to have a natural cutoff Λ and quantized via path integrals (in euclidean spacetime)W=∫DϕΛe−S[ϕ]
My question(s) is (are):
How do i put in a single framework the Wilsonian approach in witch the relations are between the parameters at the scale ΛN with those of the lagrangian L0 and their renomrmalization goup flow descibes those changes in scale with the "standard" approach in which we take Λ→+∞ and relate the bare paramters of the theory gi0 with a set of parameters gi via renormalization prescriptions at a scale μ and then control how the theory behaves at different energy scales using callan-symanzik equation ?
How different are the relations between the paramters in the wilson approach and the one in the "standard" approach? Are these even comparable?
What is the meaning (expecially in the wilsonian approach?) of sending Λ to infinity besides of getting completley ridden of non renormalizable terms in the theory?
Is, in the standard approach, giving a renormalization prescription which experimentally fixes the paramters gi at a scale μ basically the same as integrating from Λ→+∞ to the scale μ in the wilsonian approach?
I'm afraid i have some confusion here, any help would be appreciated!
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