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arXiv 1608.07628math.DG
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$R^{n+1, n}$上的各向同性曲线流

Isotropic curve flows on $R^{n+1, n}$

Chuu-Lian Terng, Zhiwei Wu

摘要:

令$R^{n+1, n}$是配备有索引为$n$的双线性形式$(X,Y)=X^t C_n Y$的向量空间$R^{2n+1}$,其中$C_n= \sum_{i=1}^{2n+1} (-1)^{n+i-1} e_{i, 2n+2-i}$。如果$γ, γ_x, \ldots, γ_x^{(2n)}$是线性无关的,并且$γ, \ldots, γ_x^{(n-1)}$的跨度是各向同性的,则光滑$γ: R\to R^{n+1,n}$是{ \it各向同性}。给定一条各向同性曲线,我们证明了存在一个唯一的平移参数,使得$(γ_x^{(n)}, γ_x^{(n)})=1$(我们称这样的参数为各向同性参数),也存在一个自然的移动框架。本文考虑了由迷向参数表示的迷向曲线空间上的两个曲线流序列。证明了这些各向同性曲线的微分不变量满足与仿射Kac-Moody代数$\hat B_n^{(1)}$和$\hat A_{2n}^{(2)}$相关联的Drinfeld-Sokolov KdV型孤子族。然后利用孤子理论的技巧构造了这些曲线流的双Hamilton结构、守恒律、Backlund变换和置换公式。

英文摘要:

Let $R^{n+1, n}$ be the vector space $R^{2n+1}$ equipped with the bilinear form $(X,Y)=X^t C_n Y$ of index $n$, where $C_n= \sum_{i=1}^{2n+1} (-1)^{n+i-1} e_{i, 2n+2-i}$. A smooth $γ: R\to R^{n+1,n}$ is {\it isotropic} if $γ, γ_x, \ldots, γ_x^{(2n)}$ are linearly independent and the span of $γ, \ldots, γ_x^{(n-1)}$ is isotropic. Given an isotropic curve, we show that there is a unique up to translation parameter such that $(γ_x^{(n)}, γ_x^{(n)})=1$ (we call such parameter the isotropic parameter) and there also exists a natural moving frame. In this paper, we consider two sequences of curve flows on the space of isotropic curves parametrized by isotropic parameter. We show that differential invariants of these isotropic curves satisfy Drinfeld-Sokolov's KdV type soliton hierarchies associated to the affine Kac-Moody algebra $\hat B_n^{(1)}$ and $\hat A_{2n}^{(2)}$ Then we use techniques from soliton theory to construct bi-Hamiltonian structure, conservation laws, Backlund transformations and permutability formulas for these curve flows.

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