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arXiv math/9906114math.APmath-phmath.DGmath.MP
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具有径向对称高斯曲率的曲面

Surfaces with radially symmetric prescribed Gauss curvature

Sagun Chanillo, Michael K. -H. Kiessling

摘要:

我们研究共形平坦的表面与规定的高斯曲率,所描述的解决方案$u$的偏微分方程:$Δu(x)+K(x)\exp(2u(x))=0$,与$K(x)$高斯曲率函数在$x\in\RR^2$。我们假设积分曲率是有限的。对于径向对称的$K$,我们引入了最小积分曲面的概念,以及当这样的曲面是临界曲面时的概念。相对于这些概念,我们分析了径向对称的$u$的整个频谱可能的积分曲率值。在一个温和的可积性条件下,我们证明了$u$是径向对称的,并且在以下几种情况下是递减的:(1)$K$是递减的,$u$是经典解,曲面的积分曲率大于临界值;(2)$K$是递减的,$u$是经典解,曲面的积分曲率是临界的,并且曲面满足一个比有限积分曲率稍强的附加可积条件:(3)$K$是非正的.在第1类和第2类中,允许$K$在空间无穷远处几何发散或按幂律发散到$-\infty$。违反一个或多个我们的条件的非径向解决方案的例子进行了讨论。特别是,对于非正和非负的$K$,满足适当的可积性条件,否则是相当任意的,我们引入概率的方法来构建曲面的有限积分曲率和整个调和渐近无穷远。对于径向对称的$K$,这些表面是对称性破缺的例子。

英文摘要:

We study conformally flat surfaces with prescribed Gaussian curvature, described by solutions $u$ of the PDE: $Δu(x)+K(x)\exp(2u(x))=0$, with $K(x)$ the Gauss curvature function at $x\in\RR^2$. We assume that the integral curvature is finite. For radially symmetric $K$ we introduce the notion of a least integrally curved surface, and also the notion of when such a surface is critical. With respect to these notions we analyze the radial symmetry of $u$ for the whole spectrum of possible integral curvature values. Under a mild integrability condition which rules out harmonic non-radial behavior near infinity, we prove that $u$ is radially symmetric and decreasing in the following categories: (1) $K$ is decreasing, $u$ a classical solution, and the integral curvature of the surface is above critical; (2) $K$ is decreasing, $u$ a classical solution, the integral curvature of the surface is critical, and the surface satisfies an additional integrability condition which is mildly stronger than finite integral curvature; (3) $K$ is non-positive. In categories 1 and 2, $K$ is allowed to diverge logarithmically or as power law to $-\infty$ at spatial infinity. Examples of nonradial solutions which violate one or more of our conditions are discussed as well. In particular, for non-positive and non-negative $K$ that satisfy appropriate integrability conditions and otherwise are fairly arbitrary, we introduce probabilistic methods to construct surfaces with finite integral curvature and entire harmonic asymptotics at infinity. For radial symmetric $K$ these surfaces are examples of broken symmetry.

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