Composite field
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In quantum field theory, a composite field is a field defined in terms of other more "elementary" fields. It might describe a composite particle (bound state) or it might not.
It might be local, or it might be nonlocal. However, "quantum fields do not exist as a point taken in isolation," so "local" does not mean literally a single point.[1]
Composite fields use a very specific kind of statistics, called "duality and arbitrary statistics".[2]
Under Noether's theorem, Noether fields are often composite fields,[3] and they are local.
In the generalized LSZ formalism, composite fields, which are usually nonlocal, are used to model asymptotic bound states.Script error: No such module "Unsubst".