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arXiv 1401.7192math.DGhep-thmath-phmath.MP
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闭2-曲面上的泛函

Functionals on Closed 2-Surfaces

Metin Gurses

摘要:

证明了${\mathbb R}^3$中的2-环面是定义在${\mathbb R}^3$中紧2-曲面上的泛函序列${\cal F}_{n}$($n=1,2,3, \cdots$)的临界点.当拉格朗日函数${\cal E}$是曲面平均曲率$H$的次数为$n$的多项式时,2-环面的半径($a,r$)与$\frac{a^2}{r^2}=\frac{n^2-n}{n^2-n-1}, n \ge 2$相关。如果拉格朗日函数依赖于平均曲率和高斯曲率,则2-环面仍然是${\cal F}_{n}$的临界点,而对环面的半径没有任何约束。

英文摘要:

We show that the 2-torus in ${\mathbb R}^3$ is a critical point of a sequence of functionals ${\cal F}_{n}$ ($n=1,2,3, \cdots$) defined over compact 2-surfaces in ${\mathbb R}^3$. When the Lagrange function ${\cal E}$ is a polynomial of degree $n$ of the mean curvature $H$ of the surface, the radii ($a,r$) of the 2-torus are related as $\frac{a^2}{r^2}=\frac{n^2-n}{n^2-n-1}, n \ge 2$. If the Lagrange function depends on both mean and Gaussian curvatures, the 2- torus remains to be a critical point of ${\cal F}_{n}$ without any constraints on the radii of the torus.

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