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arXiv 1107.2108math-phmath.AGmath.MPnlin.SI
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可积方程代数几何解的数值计算

On the numerical evaluation of algebro-geometric solutions to integrable equations

C. Kalla, C. Klein

摘要:

给出了某些可积偏微分方程的具有物理意义的周期解,这些周期解是用与实黎曼曲面相关的多维θ函数表示的。这些解决方案的数值计算中的典型分析问题进行了研究。在超椭圆曲面的情况下,甚至对于几乎退化的曲面也存在有效的算法。这使得孤子极限的数值研究。对于一般的实黎曼曲面,选择一个适合于反全纯对合的同调基对于方便地制定解和光滑条件是很重要的。由于现有的算法代数曲线产生的同源基础不相关的自同构的曲线,我们研究辛变换的适应基础,并给出明确的公式M-曲线。作为例子,我们讨论的Davey-Stewartson和多分量的非线性薛定谔方程的解决方案。

英文摘要:

Physically meaningful periodic solutions to certain integrable partial differential equations are given in terms of multi-dimensional theta functions associated to real Riemann surfaces. Typical analytical problems in the numerical evaluation of these solutions are studied. In the case of hyperelliptic surfaces efficient algorithms exist even for almost degenerate surfaces. This allows the numerical study of solitonic limits. For general real Riemann surfaces, the choice of a homology basis adapted to the anti-holomorphic involution is important for a convenient formulation of the solutions and smoothness conditions. Since existing algorithms for algebraic curves produce a homology basis not related to automorphisms of the curve, we study symplectic transformations to an adapted basis and give explicit formulae for M-curves. As examples we discuss solutions of the Davey-Stewartson and the multi-component nonlinear Schrödinger equations.

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