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arXiv 0706.3370nlin.SImath-phmath.MP
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Ablowitz-Ladik族的代数几何初值问题

The algebro-geometric initial value problem for the Ablowitz-Ladik hierarchy

F. Gesztesy, H. Holden, J. Michor, G. Teschl

摘要:

本文讨论了复初值下的Ablowitz-Ladik方程族的代数几何初值问题,证明了对于一组满测度的初值(Dirichlet因子),方程族在时间上的唯一全局可解性.为此,我们开发了一种新的算法,用于构建固定的复值代数几何解决方案的Ablowitz-拉迪克层次,这是独立的兴趣,因为它解决了逆代数几何谱问题一般(非酉)Ablowitz-拉迪克Lax运营商,从一组适当选择的初始因子的充分措施。结合一个适当的一阶系统的微分方程的时间(替代著名的Dubrovin型方程),这产生了建设的全球algebro几何解决方案的时间依赖的Ablowitz-Ladik的层次。一般(非酉)Lax算子与一般系数的Ablowitz-Ladik层次的治疗带来了各种困难,据我们所知,成功地克服了这里的第一次。我们的方法不局限于Ablowitz-Ladik族,但一般适用于(1+1)维完全可积的微分差分型孤子方程。

英文摘要:

We discuss the algebro-geometric initial value problem for the Ablowitz-Ladik hierarchy with complex-valued initial data and prove unique solvability globally in time for a set of initial (Dirichlet divisor) data of full measure. To this effect we develop a new algorithm for constructing stationary complex-valued algebro-geometric solutions of the Ablowitz-Ladik hierarchy, which is of independent interest as it solves the inverse algebro-geometric spectral problem for general (non-unitary) Ablowitz-Ladik Lax operators, starting from a suitably chosen set of initial divisors of full measure. Combined with an appropriate first-order system of differential equations with respect to time (a substitute for the well-known Dubrovin-type equations), this yields the construction of global algebro-geometric solutions of the time-dependent Ablowitz-Ladik hierarchy. The treatment of general (non-unitary) Lax operators associated with general coefficients for the Ablowitz-Ladik hierarchy poses a variety of difficulties that, to the best of our knowledge, are successfully overcome here for the first time. Our approach is not confined to the Ablowitz-Ladik hierarchy but applies generally to (1+1)-dimensional completely integrable soliton equations of differential-difference type.

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