The equivalence theorem states that an invertible local field redefinition leaves on-shell S-matrix elements unchanged, although it changes off-shell correlation functions and individual interaction vertices.
A field redefinition is an invertible change of variables among fields. Local field redefinitions can rearrange higher-derivative operators without changing on-shell scattering amplitudes.
A redundant operator is an interaction that can be removed by an invertible local field redefinition or by integration by parts together with the equations of motion. It can change off-shell formulas while leaving the on-shell S-matrix unchanged.
Articles by others on the same topic
There are currently no matching articles.