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arXiv 1710.00533math.DG
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非矩形共形类的第一显式约束Willmore极小元

First explicit constrained Willmore minimizers of non-rectangular conformal class

Lynn Heller, Cheikh Birahim Ndiaye

摘要:

我们研究了$3$空间中的浸入环面在其各自的共形类中最小化Willmore能量。在矩形共形类$\;(0,b)\;$与$\;b \sim 1\;$的齐次环面$\;f^b\;$已知是唯一的约束Willmore极小(不变性)。在本文中,我们推广了这一结果,并表明,在\cite{HelNdi2}中构造的候选确实是在某些非矩形共形类$\;(a,b).\;$中的约束Willmore极小元。困难来自于这样一个事实,即这些极小元对于$\;a \neq 0\;$是非退化的,但光滑地收敛到退化的齐次环面$\;f^b\;$作为$\;a \longrightarrow 0.\;$作为我们的论点的副产品,我们证明了对于某些$\;a^b>0\;$和固定的$\;b \sim 1,\;$ $b \neq 1.$,最小Willmore能量$\;ω(a,b)\;$在$\;a \in (0, a^b)\;$中是实解析的和凹的

英文摘要:

We study immersed tori in $3$-space minimizing the Willmore energy in their respective conformal class. Within the rectangular conformal classes $\;(0,b)\;$ with $\;b \sim 1\;$ the homogenous tori $\;f^b\;$ are known to be the unique constrained Willmore minimizers (up to invariance). In this paper we generalize this result and show that the candidates constructed in \cite{HelNdi2} are indeed constrained Willmore minimizers in certain non-rectangular conformal classes $\;(a,b).\;$ Difficulties arise from the fact that these minimizers are non-degenerate for $\;a \neq 0\;$ but smoothly converge to the degenerate homogenous tori $\;f^b\;$ as $\;a \longrightarrow 0.\;$ As a byproduct of our arguments, we show that the minimal Willmore energy $\;ω(a,b)\;$ is real analytic and concave in $\;a \in (0, a^b)\;$ for some $\;a^b>0\;$ and fixed $\;b \sim 1,\;$ $b \neq 1.$

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