Editing Mean-field theory (section)

==Extension to time-dependent mean fields==
{{Main|Dynamical mean field theory}}

In mean field theory, the mean field appearing in the single-site problem is a time-independent scalar or vector quantity. However, this isn't always the case: in a variant of mean field theory called [[dynamical mean field theory]] (DMFT), the mean field becomes a time-dependent quantity. For instance, DMFT can be applied to the [[Hubbard model]] to study the metal–Mott-insulator transition.