Integrable discretizations of derivative nonlinear Schroedinger equations

Details Integrable discretizations of derivative nonlinear Schroedinger equations Integrable discretizations of derivative nonlinear Schroedinger equations

2001-05-24

arxiv.org/abs/nlin/0105053v3

J.Phys.A35:7827,2002

Nonlinear Sciences

Exactly Solvable and Integrable Systems

24 pages, LaTeX2e (IOP style), final version

Scientific paper

10.1088/0305-4470/35/36/310

We propose integrable discretizations of derivative nonlinear Schroedinger (DNLS) equations such as the Kaup-Newell equation, the Chen-Lee-Liu equation and the Gerdjikov-Ivanov equation by constructing Lax pairs. The discrete DNLS systems admit the reduction of complex conjugation between two dependent variables and possess bi-Hamiltonian structure. Through transformations of variables and reductions, we obtain novel integrable discretizations of the nonlinear Schroedinger (NLS), modified KdV (mKdV), mixed NLS, matrix NLS, matrix KdV, matrix mKdV, coupled NLS, coupled Hirota, coupled Sasa-Satsuma and Burgers equations. We also discuss integrable discretizations of the sine-Gordon equation, the massive Thirring model and their generalizations.

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