this entry is about the concept of quantumfield theory, for the concept in group theory/representation theory see at effective group action; for disambiguation see effective action
algebraic quantum field theory (perturbative, on curved spacetimes, homotopical)
quantum mechanical system, quantum probability
interacting field quantization
In the context of (perturbative) quantum field theory an effective action is an object obtained from a more fundamental (interaction) action functional by “averaging out” certain dependencies.
For the plain effective action see at S-matrix the section Effective action.
More generally, for the relative effective action see at effective field theory the section Relative effective actions.
A discussion (with an eye towards supersymmetric quantum field theory and Seiberg duality) is in section 2.1 of
A review of effective actions in the background field formalism is in section 3.1 of
Last revised on April 5, 2020 at 10:13:31. See the history of this page for a list of all contributions to it.