The periodic defocusing Ablowitz-Ladik equation and the geometry of Floquet CMV matrices

Details The periodic defocusing Ablowitz-Ladik equation and the geometry of Floquet CMV matrices The periodic defocusing Ablowitz-Ladik equation and the geometry of Floquet CMV matrices

2011-03-23

arxiv.org/abs/1103.4596v1

Physics

Mathematical Physics

57 pages

Scientific paper

In this work, we show that the periodic defocusing Ablowitz-Ladik equation can be expressed as an isospectral deformation of Floquet CMV matrices. We then introduce a Poisson Lie group whose underlying group is a loop group and show that the set of Floquet CMV matrices is a Coxeter dressing orbit of this Poisson Lie group. By using the group-theoretic framework, we establish the Liouville integrability of the equation by constructing action-angle variables, we also solve the Hamiltonian equations generated by the commuting flows via Riemann-Hilbert factorization problems.

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