Non-linear sigma model
CLASS OF QUANTUM FIELD THEORY MODELS
Target manifold; Nonlinear sigma model; Nonlinear σ-model; Nonlinear sigma models; Non linear sigma model
In quantum field theory, a nonlinear σ model describes a scalar field which takes on values in a nonlinear manifold called the target manifold T. The non-linear σ-model was introduced by , who named it after a field corresponding to a spinless meson called σ in their model.