Non-linear Sigma Model
In quantum field theory, a nonlinear σ model describes a scalar field Σ which takes on values in a nonlinear manifold called the target manifold T. The non-linear σ-model was introduced by Gell-Mann & Lévy (1960, section 6), who named it after a field corresponding to a spin 0 meson called σ in their model.
Read more about Non-linear Sigma Model: Description, O(3) Non-linear Sigma Model
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