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Generalized traveling-wave method, variational approach, and modified conserved quantities for the perturbed nonlinear Schrödinger equation.

 

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Opened Access Generalized traveling-wave method, variational approach, and modified conserved quantities for the perturbed nonlinear Schrödinger equation.
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Author: Quintero, Niurka R.
Mertens, Franz G.
Bishop, Alan R.
Department: Universidad de Sevilla. Departamento de Física Aplicada I
Date: 2010
Published in: Physical Review E, 2010, 82 (1), 016606: 1-6
Document type: Article
Abstract: The generalized traveling wave method (GTWM) is developed for the nonlinear Schrödinger equation (NLSE) with general perturbations in order to obtain the equations of motion for an arbitrary number of collective coordinates. Regardless of the particular ansatz that is used, it is shown that this alternative approach is equivalent to the Lagrangian formalism, but has the advantage that only the Hamiltonian of the unperturbed system is required, instead of the Lagrangian for the perturbed system. As an explicit example, we take 4 collective coordinates, namely the position, velocity, amplitude and phase of the soliton, and show that the GTWM yields the same equations of motion as the perturbation theory based on the Inverse Scattering Transform and as the time variation of the norm, first moment of the norm, momentum, and energy for the perturbed NLSE.
Size: 133.2Kb
Format: PDF

URI: http://hdl.handle.net/11441/23531

DOI: 10.1103/PhysRevE.82.016606

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