Abstract
We suggest the six-component integrable nonlinear system on a quasi-one-dimensional lattice. Due to its symmetrical form, the general system permits a number of reductions; one of which treated as the semi-discrete integrable nonlinear Schrödinger system on a lattice with three structural elements in the unit cell is considered in considerable details. Besides six truly independent basic field variables, the system is characterized by four concomitant fields whose background values produce three additional types of inter-site resonant interactions between the basic fields. As a result, the system dynamics becomes associated with the highly nonstandard form of Poisson structure. The elementary Poisson brackets between all field variables are calculated and presented explicitly. The richness of system dynamics is demonstrated on the multi-component soliton solution written in terms of properly parameterized soliton characteristics.
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The work has been supported by the National Academy of Sciences of Ukraine within the Program No. 0115U005302.
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Vakhnenko, O.O. Six-component semi-discrete integrable nonlinear Schrödinger system. Lett Math Phys 108, 1807–1824 (2018). https://doi.org/10.1007/s11005-018-1049-0
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DOI: https://doi.org/10.1007/s11005-018-1049-0
Keywords
- Nonlinear lattice
- Integrable system
- Natural constraint
- Concomitant field
- Resonant coupling
- Hamiltonian function
- Poisson structure
- Multi-component soliton