Kinks from Dynamical Systems: Domain Walls in a Deformed O(N) Linear   Sigma Model
  It is shown how a integrable mechanical system provides all the localized static solutions of a deformation of the linear O(N)-sigma model in two space-time dimensions. The proof is based on the Hamilton-Jacobi separability of the mechanical analogue system that follows when time-independent field configurations are being considered. In particular, we describe the properties of the different kinds of kinks in such a way that a hierarchical structure of solitary wave manifolds emerges for distinct N. 
A. Alonso Izquierdo, M.A. Gonzalez Leon, J. Mateos Guilarte