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arXiv 1003.5767math-phhep-thmath.MPnlin.SI
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泛Whitham族的非退化解

Non-degenerate solutions of universal Whitham hierarchy

Kanehisa Takasaki, Takashi Takebe, Lee Peng Teo

摘要:

将无色散Toda方程族的非退化解的概念推广到亏格为零的泛Whitham方程族的$M+1$标记点.这些解的特征在于关于二维正则变换的Riemann-Hilbert问题(广义弦方程),并且可以被认为是该族的一种通解。Riemann-Hilbert问题包含$M$任意函数$H_a(z_0,z_a)$,$a = 1,...,M$,它们起着二维正则变换的生成函数的作用。Riemann-Hilbert问题的解是由黎曼球面的$M$圆及其补球面的共形映射的$(M+1)$ -元组$(z_α(p) : α= 0,1,...,M)$空间上的周期映射描述的。周期映射是由无穷多个围道积分定义的,这些围道积分推广了调和矩的概念。这些解决方案的$F$ -功能(自由能)也示出具有轮廓积分表示。

英文摘要:

The notion of non-degenerate solutions for the dispersionless Toda hierarchy is generalized to the universal Whitham hierarchy of genus zero with $M+1$ marked points. These solutions are characterized by a Riemann-Hilbert problem (generalized string equations) with respect to two-dimensional canonical transformations, and may be thought of as a kind of general solutions of the hierarchy. The Riemann-Hilbert problem contains $M$ arbitrary functions $H_a(z_0,z_a)$, $a = 1,...,M$, which play the role of generating functions of two-dimensional canonical transformations. The solution of the Riemann-Hilbert problem is described by period maps on the space of $(M+1)$-tuples $(z_α(p) : α= 0,1,...,M)$ of conformal maps from $M$ disks of the Riemann sphere and their complements to the Riemann sphere. The period maps are defined by an infinite number of contour integrals that generalize the notion of harmonic moments. The $F$-function (free energy) of these solutions is also shown to have a contour integral representation.

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