We study properties of field redefintions in QFT. First, by exploring its effects on the S-matrix, leading to the equivalence theorem of the S-matrix. Second, we discuss how, in Effective Field Theories, field redefinitions have to respect the power counting. Third, we discuss applications of field redefinitions to the non-perturbative RG, making only the essential couplings scale dependent. This becomes very important in the case of physical systems with many couplings. We apply this to the 3 dimensional Ising model.

Field Redefinitions in QFT / Benhaddouche, Zakaria. - (2022 Jan 31).

Field Redefinitions in QFT

BENHADDOUCHE, ZAKARIA
2022-01-31

Abstract

We study properties of field redefintions in QFT. First, by exploring its effects on the S-matrix, leading to the equivalence theorem of the S-matrix. Second, we discuss how, in Effective Field Theories, field redefinitions have to respect the power counting. Third, we discuss applications of field redefinitions to the non-perturbative RG, making only the essential couplings scale dependent. This becomes very important in the case of physical systems with many couplings. We apply this to the 3 dimensional Ising model.
31-gen-2022
Percacci, Roberto
Benhaddouche, Zakaria
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/136610
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