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arXiv 2102.06597math.DGmath.AP
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任意余维数下曲线的Li-Yau型不等式

Li-Yau type inequality for curves in any codimension

Tatsuya Miura

AI总结:

本研究针对任意余维数欧氏空间中的浸入曲线建立Li-Yau型不等式,给出弯曲能下界,证明多数情形下的最优性及奇数重数平面闭曲线的非最优性,采用变分法结合相关分类与定理,还探讨了相关应用。

摘要:

针对任意余维数欧氏空间中的浸入曲线,我们建立了一个Li–Yau型不等式,该不等式以重数为参数给出了(归一化)弯曲能的下界。所得不等式对任意余维数和任意重数均为最优,仅奇数重数的平面闭曲线情形除外;在这一剩余情形中,我们发现了一个隐藏的代数障碍,并切实证明了一个完备的非最优性结果。该证明主要采用变分法,涉及Langer–Singer的弹性曲线分类以及André针对某类超几何函数的代数无关性定理。我们还讨论了其在弹性流、网络和纽结中的应用。

英文摘要:

For immersed curves in Euclidean space of any codimension we establish a Li--Yau type inequality that gives a lower bound of the (normalized) bending energy in terms of multiplicity. The obtained inequality is optimal for any codimension and any multiplicity except for the case of planar closed curves with odd multiplicity; in this remaining case we discover a hidden algebraic obstruction and indeed prove an exhaustive non-optimality result. The proof is mainly variational and involves Langer--Singer's classification of elasticae and André's algebraic-independence theorem for certain hypergeometric functions. We also discuss applications to elastic flows, networks, and knots.

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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