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arXiv 0705.0346nlin.SImath-phmath.MP
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周期Toda晶格在短程扰动下的稳定性

Stability of the periodic Toda lattice under short range perturbations

Spyridon Kamvissis, Gerald Teschl

摘要:

我们考虑的稳定性的周期Toda晶格(略一般的代数几何有限间隙晶格)下的短程扰动。我们证明了扰动晶格渐近地接近调制晶格。更准确地说,让$g$是与未扰动解相关的超椭圆曲线的亏格。我们发现,除了在准周期背景上传播的孤子的现象,$n/t$ -窗格包含$g+2$地区的扰动解决方案是接近于一个有限的间隙解决方案在同一等谱环面。在两者之间有$g+1$区域,其中扰动的解决方案是渐近接近调制的晶格经历了连续的相变(在雅可比品种),并插入这些等谱的解决方案之间。在自由格点($g=0$)的特殊情况下,等谱环面仅由一个点组成,我们恢复了已知的结果。无论是在等谱环面和相变的解决方案明确的特征在于在基础的超椭圆曲线上的阿贝尔积分。我们的方法依赖于等价的逆谱问题的矩阵Riemann-Hilbert问题上定义的超椭圆曲线和推广所谓的非线性固定相/最速下降法Riemann-Hilbert问题变形黎曼曲面。

英文摘要:

We consider the stability of the periodic Toda lattice (and slightly more generally of the algebro-geometric finite-gap lattice) under a short range perturbation. We prove that the perturbed lattice asymptotically approaches a modulated lattice. More precisely, let $g$ be the genus of the hyperelliptic curve associated with the unperturbed solution. We show that, apart from the phenomenon of the solitons travelling on the quasi-periodic background, the $n/t$-pane contains $g+2$ areas where the perturbed solution is close to a finite-gap solution in the same isospectral torus. In between there are $g+1$ regions where the perturbed solution is asymptotically close to a modulated lattice which undergoes a continuous phase transition (in the Jacobian variety) and which interpolates between these isospectral solutions. In the special case of the free lattice ($g=0$) the isospectral torus consists of just one point and we recover the known result. Both the solutions in the isospectral torus and the phase transition are explicitly characterized in terms of Abelian integrals on the underlying hyperelliptic curve. Our method relies on the equivalence of the inverse spectral problem to a matrix Riemann--Hilbert problem defined on the hyperelliptic curve and generalizes the so-called nonlinear stationary phase/steepest descent method for Riemann--Hilbert problem deformations to Riemann surfaces.

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