Recursion operators and bi-Hamiltonian representations of cubic evolutionary (2+1)-dimensional systems

Abstract

We construct all (2+1)-dimensional PDEs depending only on 2nd-order derivatives of unknown which have the Euler-Lagrange form and determine the corresponding Lagrangians. We convert these equations and their Lagrangians to two-component forms and find Hamiltonian representations of all these systems using Dirac's theory of constraints. We consider three-parameter integrable equations that are cubic in partial derivatives of the unknown applying our method of skew factorization of the symmetry condition. Lax pairs and recursion relations for symmetries are determined both for one-component and two-component forms. For cubic three-parameter equations in the two-component form we obtain recursion operators in $2\times 2$ matrix form and bi-Hamiltonian representations, thus discovering three new bi-Hamiltonian (2+1) systems.

24 pages, LaTeX2e, major revision. generalization of results

References in corpus (4)

• A Simple Construction of Recursion Operators for Multidimensional Dispersionless Integrable Systems
• Recursion Operators and Tri-Hamiltonian Structure of the First Heavenly Equation of Plebański
• Recursion operators and bi-Hamiltonian structure of the general heavenly equation
• Evolutionary Hirota Type (2+1)-Dimensional Equations: Lax Pairs, Recursion Operators and Bi-Hamiltonian Structures