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arXiv 1111.0390math.APmath.DG
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奇异源$SU(n+1)$ Toda系统的分类与非退化性

Classification and nondegeneracy of $SU(n+1)$ Toda system with singular sources

Chang-Shou Lin, Dong Ye, Juncheng Wei

摘要:

考虑Toda系统Δu_i + \D \sum_{j = 1}^n a_{ij} e^{u_j} = 4πγ_{i}δ_{0} \text{in} \mathbb R ^2,\int_{\mathbb R^2} e^{u_i} dx < \infty,\forall 1 \leq i \leq n,其中$γ_{i} > -1$,$δ_0$是0处的Dirac测度,系数$a_{ij}$构成标准的三对角Cartan矩阵.本文(i)对解进行了完全分类并得到了量子化结果:$$\sum_{j=1}^n a_{ij}\int_{\R^2}e^{u_j} dx = 4π(2+γ_i+γ_{n+1-i}), \;\;\forall\; 1\leq i \leq n.$$这推广了Jost和Wang对$γ_i=0$,$\forall \;1\leq i\leq n$的分类结果。(ii)证明了如果对所有的$1\leq i\leq j\leq n$都有$γ_i+γ_{i+1}+...+γ_j \notin \mathbb Z$,则任何解$u_i$都是\textit{radially symmetric} w.r.t. 0. (iii)我们证明了线性化方程在任意解处都是\textit{non-degenerate}。这些是理解Toda系统的起泡行为的基本结果。

英文摘要:

We consider the following Toda system Δu_i + \D \sum_{j = 1}^n a_{ij}e^{u_j} = 4πγ_{i}δ_{0} \text{in}\mathbb R^2, \int_{\mathbb R^2}e^{u_i} dx < \infty, \forall 1\leq i \leq n, where $γ_{i} > -1$, $δ_0$ is Dirac measure at 0, and the coefficients $a_{ij}$ form the standard tri-diagonal Cartan matrix. In this paper, (i) we completely classify the solutions and obtain the quantization result: $$\sum_{j=1}^n a_{ij}\int_{\R^2}e^{u_j} dx = 4π(2+γ_i+γ_{n+1-i}), \;\;\forall\; 1\leq i \leq n.$$ This generalizes the classification result by Jost and Wang for $γ_i=0$, $\forall \;1\leq i\leq n$. (ii) We prove that if $γ_i+γ_{i+1}+...+γ_j \notin \mathbb Z$ for all $1\leq i\leq j\leq n$, then any solution $u_i$ is \textit{radially symmetric} w.r.t. 0. (iii) We prove that the linearized equation at any solution is \textit{non-degenerate}. These are fundamental results in order to understand the bubbling behavior of the Toda system.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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