A Study of Nonholonomic Deformations of Nonlocal Integrable Systems Belonging to the Nonlinear Schrödinger Family


    2019, Vol. 15, no. 3, pp.  293-307

    Author(s): Mukherjee I., Guha P.

    The nonholonomic deformations of nonlocal integrable systems belonging to the nonlinear Schrödinger family are studied using the bi-Hamiltonian formalism as well as the Lax pair method. The nonlocal equations are first obtained by symmetry reductions of the variables in the corresponding local systems. The bi-Hamiltonian structures of these equations are explicitly derived. The bi-Hamiltonian structures are used to obtain the nonholonomic deformation following the Kupershmidt ansatz. Further, the same deformation is studied using the Lax pair approach and several properties of the deformation are discussed. The process is carried out for coupled nonlocal nonlinear Schrödinger and derivative nonlinear Schrödinger (Kaup Newell) equations. In the case of the former, an exact equivalence between the deformations obtained through the bi-Hamiltonian and Lax pair formalisms is indicated.
    Keywords: nonlocal integrable systems, nonlinear Schr¨odinger equation, Kaup –Newell equation, bi-Hamiltonian system, Lax method, nonholonomic deformation
    Citation: Mukherjee I., Guha P., A Study of Nonholonomic Deformations of Nonlocal Integrable Systems Belonging to the Nonlinear Schrödinger Family, Rus. J. Nonlin. Dyn., 2019, Vol. 15, no. 3, pp.  293-307
    DOI:10.20537/nd190308


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