Multi-Hamiltonian structure for the finite defocusing Ablowitz-Ladik equation

Details Multi-Hamiltonian structure for the finite defocusing Ablowitz-Ladik equation Multi-Hamiltonian structure for the finite defocusing Ablowitz-Ladik equation

2007-06-16

arxiv.org/abs/0706.2428v1

Nonlinear Sciences

Exactly Solvable and Integrable Systems

Scientific paper

We study the Poisson structure associated to the defocusing Ablowitz-Ladik equation from a functional-analytical point of view, by reexpressing the Poisson bracket in terms of the associated Caratheodory function. Using this expression, we are able to introduce a family of compatible Poisson brackets which form a multi-Hamiltonian structure for the Ablowitz-Ladik equation. Furthermore, we show using some of these new Poisson brackets that the Geronimus relations between orthogonal polynomials on the unit circle and those on the interval define an algebraic and symplectic mapping between the Ablowitz-Ladik and Toda hierarchies.

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