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arXiv 2103.07158math.ATmath.GT
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持续同调中测地线的足迹

Footprints of geodesics in persistent homology

Žiga Virk

摘要:

给出了度量空间$X$和度量空间$A\subset X$,证明了$A$可以在$X$的持久同调中生成各种代数元.我们称这种元素为$A$的(代数)足迹。我们的研究结果表明,足迹通常出现在尺寸以上的$A$的尺寸。因此,高维持久同源性编码$X$的低维几何特征。我们特别注意测地线表面$X$中的一种特定类型的测地线,称为测地线圆。我们解释他们如何可能产生非平凡的奇维和二维足迹。特别是,我们甚至可以检测到一些收缩测地线使用二维和三维的持续同源。这提供了黎曼几何中持久同调和长度谱之间的联系。

英文摘要:

Given a metric space $X$ and a subspace $A\subset X$, we prove $A$ can generate various algebraic elements in persistent homology of $X$. We call such elements (algebraic) footprints of $A$. Our results imply that footprints typically appear in dimensions above the dimension of $A$. Higher-dimensional persistent homology thus encodes lower-dimensional geometric features of $X$. We pay special attention to a specific type of geodesics in a geodesic surface $X$ called geodesic circles. We explain how they may generate non-trivial odd-dimensional and two-dimensional footprints. In particular, we can detect even some contractible geodesics using two- and three-dimensional persistent homology. This provides a link between persistent homology and length spectrum in Riemannian geometry.

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