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A direct method of solution for the Fokas-Lenells derivative nonlinear Schrödinger equation. I: Bright soliton solutions. (English) Zbl 1245.82055

Summary: We develop a direct method of solution for finding the bright \(N\)-soliton solution of the Fokas-Lenells derivative nonlinear Schrödinger equation. The construction of the solution is performed by means of a purely algebraic procedure using an elementary theory of determinants and does not rely on the inverse scattering transform method. We present two different expressions of the solution both of which are expressed as a ratio of determinants. We then investigate the properties of the solutions and find several new features. Specifically, we derive the formula for the phase shift caused by the collisions of bright solitons.

MSC:

82C31 Stochastic methods (Fokker-Planck, Langevin, etc.) applied to problems in time-dependent statistical mechanics
35Q55 NLS equations (nonlinear Schrödinger equations)
35C08 Soliton solutions
82B26 Phase transitions (general) in equilibrium statistical mechanics