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arXiv 2006.02529math.DG
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共形欧氏三球中自由边界CMC曲面的Gap结果

Gap results for free boundary CMC surfaces in conformally Euclidean three-balls

Maria Andrade, Ezequiel Barbosa, Edno Pereira

摘要:

在这项工作中,我们认为$M=(\mathbb{B}^3_r,\bar{g})$作为欧几里德三球半径$r$配备的度量$\bar{g}=e^{2h}\left\langle , \right\rangle$共形的欧几里德度量。我们表明,如果一个自由边界CMC表面$Σ$在$M$满足一个pinching条件的长度上的无痕的第二基本张量,其中涉及的支持功能的$Σ$,位置共形矢量场$\vec{x}$和它的潜在功能$σ,$然后要么$Σ$是一个磁盘或$Σ$是一个环形旋转对称。在一种特殊情况下,当$M$是高斯空间时,我们构造了$M$中具有严格凸边界的极小曲面的例子,说明了我们的结果.这些结果推广到了CMC情形,也推广到了其它许多不同的共形欧氏空间,这是李海忠和熊昌伟的主要结果。

英文摘要:

In this work, we consider $M=(\mathbb{B}^3_r,\bar{g})$ as the Euclidean three-ball with radius $r$ equipped with the metric $\bar{g}=e^{2h}\left\langle , \right\rangle$ conformal to the Euclidean metric. We show that if a free boundary CMC surface $Σ$ in $M$ satisfies a pinching condition on the length of the traceless second fundamental tensor which involves the support function of $Σ$, the positional conformal vector field $\vec{x}$ and its potential function $σ,$ then either $Σ$ is a disk or $Σ$ is an annulus rotationally symmetric. In a particular case, we construct an example of minimal surface with strictly convex boundary in $M$, when $M$ is the Gaussian space, that illustrate our results. These results extend to the CMC case and to many others different conformally Euclidean spaces the main result obtained by Haizhong Li and Changwei Xiong.

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