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- W4321503155 abstract "We study the Hamiltonian formalism for second order and fourth order nonlinear Schr{o}dinger equations. In the case of second order equation, we consider cubic and logarithmic nonlinearities. Since the Lagrangians generating these nonlinear equations are degenerate, we follow the Dirac-Bergmann formalism to construct their corresponding Hamiltonians. In order to obtain consistent equations of motion, the Dirac-Bergmann formalism imposes some set of constraints which contribute to the total Hamiltonian along with their Lagrange multipliers. The order of the Lagrangian degeneracy determines the number of the primary constraints. Multipliers are determined by the time consistency of constraints. If a constraint is not a constant of motion, a secondary constraint is introduced to force the consistency. We show that for both second order nonlinear Schr{o}dinger equations we only have primary constraints, and the form of nonlinearity does not change the constraint dynamics of the system. However, introducing a higher order dispersion changes the constraint dynamics and secondary constraints are needed to construct a consistent Hamilton equations of motion." @default.
- W4321503155 created "2023-02-23" @default.
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- W4321503155 date "2023-06-01" @default.
- W4321503155 modified "2023-09-25" @default.
- W4321503155 title "Hamiltonian formalism for nonlinear Schrödinger equations" @default.
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- W4321503155 doi "https://doi.org/10.1016/j.cnsns.2023.107191" @default.
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