Nonlinear Sciences – Exactly Solvable and Integrable Systems
Scientific paper
2004-04-28
J.Nonlin.Math.Phys.12:105-117,2005
Nonlinear Sciences
Exactly Solvable and Integrable Systems
11 pages, LaTex, version to be published in Journal of Nonlinear Mathematical Physics, has expanded discussion
Scientific paper
In this paper, we study the properties of a nonlinearly dispersive integrable system of fifth order and its associated hierarchy. We describe a Lax representation for such a system which leads to two infinite series of conserved charges and two hierarchies of equations that share the same conserved charges. We construct two compatible Hamiltonian structures as well as their Casimir functionals. One of the structures has a single Casimir functional while the other has two. This allows us to extend the flows into negative order and clarifies the meaning of two different hierarchies of positive flows. We study the behavior of these systems under a hodograph transformation and show that they are related to the Kaup-Kupershmidt and the Sawada-Kotera equations under appropriate Miura transformations. We also discuss briefly some properties associated with the generalization of second, third and fourth order Lax operators.
Das Ashok
Popowicz Ziemowit
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