Editing Composite field (section)

{{Short description|Field composed from other elementary fields}}
{{See also|Composite field (mathematics)}}
{{Unreferenced stub|auto=yes|date=December 2009}}
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 [[Principle of locality|local]], or it might be [[quantum nonlocality|nonlocal]]. [[Noether field]]s are often composite fields and they are local.

In the generalized [[LSZ formalism]], composite fields, which are usually nonlocal, are used to model [[asymptotic]] bound states.