arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.01550math.GTmath.DS
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从曲线到流(currents)

From curves to currents

Dídac Martínez-Granado, Dylan P. Thurston

AI总结:

该研究提出了一个保证闭曲线上实值函数可连续延拓到测地流空间的简单判据,核心为光滑性质,既覆盖已有示例也适用于极值长度等新情形,并借此得到极值长度的新曲线计数结果。

摘要:

已知许多定义在闭曲线上的自然实值函数可连续延拓到更大的测地流(geodesic currents)空间。例如,关于固定双曲度量的长度函数的延拓,曾是测地流发展过程中的一个 motivating 示例。我们给出了一个关于曲线函数的简单判据,可保证其能连续延拓到测地流空间。该判据的核心条件是光滑性质(smoothing property),这一性质在 Anosov 表示的平移长度收缩(systoles)研究中已发挥作用。不难看出,几乎所有已知的测地流上连续函数示例都满足我们的判据,比如非正曲率长度或曲面群的稳定长度,同时该判据也适用于极值长度等新示例。我们利用这一延拓得到了一个关于极值长度的新曲线计数结果。

英文摘要:

Many natural real-valued functions of closed curves are known to extend continuously to the larger space of geodesic currents. For instance, the extension of length with respect to a fixed hyperbolic metric was a motivating example for the development of geodesic currents. We give a simple criterion on a curve function that guarantees a continuous extension to geodesic currents. The main condition of our criterion is the smoothing property, which has played a role in the study of systoles of translation lengths for Anosov representations. It is easy to see that our criterion is satisfied for almost all the known examples of continuous functions on geodesic currents, such as non-positively curved lengths or stable lengths for surface groups, while also applying to new examples like extremal length. We use this extension to obtain a new curve counting result for extremal length.

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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