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arXiv 1407.0601math.DG
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曲线空间上Sobolev算子的完备性

Completeness Properties of Sobolev Metrics on the Space of Curves

Martins Bruveris

摘要:

研究了Sobolev度量在浸入曲线空间和非参数化曲线形状空间上的完备性。我们证明了Sobolev度量的顺序$n\geq 2$度量完全的空间$\mathcal I^n(S^1,\mathbb R^d)$的Sobolev浸入相同的规律性和任何两条曲线在同一个连接组件可以加入一个最小化测地线。这些结果意味着非参数化曲线的形状空间具有完全长度空间的结构。

英文摘要:

We study completeness properties of Sobolev metrics on the space of immersed curves and on the shape space of unparametrized curves. We show that Sobolev metrics of order $n\geq 2$ are metrically complete on the space $\mathcal I^n(S^1,\mathbb R^d)$ of Sobolev immersions of the same regularity and that any two curves in the same connected component can be joined by a minimizing geodesic. These results then imply that the shape space of unparametrized curves has the structure of a complete length space.

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