algebraic quantum field theory (perturbative, on curved spacetimes, homotopical)
field theory: classical, pre-quantum, quantum, perturbative quantum
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
Review includes
A review of effective actions in the background field formalism is in section 3.1 of
Last revised on February 8, 2018 at 15:10:48. See the history of this page for a list of all contributions to it.