S.A. Bronsard and D.E. Pelinovsky
New integrable semi-discretizations of the coupled nonlinear Schr0dinger equations
Abstract:
We have undertaken an algorithmic search for new integrable semi-discretizations of physically
relevant nonlinear partial differential equations. The search is performed by using a compatibility
condition for the discrete Lax operators and symbolic computations. We have discovered a new
integrable system of coupled nonlinear Schrodinger equations which combines elements of
the Ablowitz-Ladik lattice and the triangular-lattice ribbon studied by Vakhnenko. We show that the continuum
limit of the new integrable system is given by uncoupled complex modified Korteweg-de Vries equations
and uncoupled nonlinear Schrodinger equations.
Keywords:
integrable systems, Lax pairs, semi-discretizations, Ablowitz-Ladik lattice, triangular-lattice ribbon,
coupled nonlinear Schrodinger equations