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arXiv 1703.03323math.APmath.DG
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浸入曲线空间上的分数Sobolev度量

Fractional Sobolev metrics on spaces of immersed curves

Martin Bauer, Martins Bruveris, Boris Kolev

摘要:

受形状分析领域应用的启发,我们研究了光滑正则曲线空间$\operatorname{Imm}(S^1,\mathbb{R}^d)$及其Sobolev完备化空间$\mathcal{I}^{q}(S^1,\mathbb{R}^{d})$上的重参数化不变分数阶Sobolev型度量.我们证明了局部适定性的测地线方程的巴拿赫流形$\mathcal{I}^{q}(S^1,\mathbb{R}^{d})$和Fréchet流形$\operatorname{Imm}(S^1,\mathbb{R}^d)$上的度量的阶是大于或等于一。此外,我们还证明了当$s>\frac 32$满足一定条件时,$H^s$度量在同阶$s$的巴拿赫流形$\mathcal{I}^{s}(S^1,\mathbb{R}^{d})$上诱导出强黎曼度量.这些研究也可以被解释为右不变度量分析的推广。

英文摘要:

Motivated by applications in the field of shape analysis, we study reparametrization invariant, fractional order Sobolev-type metrics on the space of smooth regular curves $\operatorname{Imm}(S^1,\mathbb{R}^d)$ and on its Sobolev completions $\mathcal{I}^{q}(S^1,\mathbb{R}^{d})$. We prove local well-posedness of the geodesic equations both on the Banach manifold $\mathcal{I}^{q}(S^1,\mathbb{R}^{d})$ and on the Fréchet-manifold $\operatorname{Imm}(S^1,\mathbb{R}^d)$ provided the order of the metric is greater or equal to one. In addition we show that the $H^s$-metric induces a strong Riemannian metric on the Banach manifold $\mathcal{I}^{s}(S^1,\mathbb{R}^{d})$ of the same order $s$, provided $s>\frac 32$. These investigations can be also interpreted as a generalization of the analysis for right invariant metrics on the diffeomorphism group.

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