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arXiv 2108.07531math.DGmath.FAmath.MG
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非塌陷$\mathsf{RCD}(K,N)$空间上的平行输运

Parallel transport on non-collapsed $\mathsf{RCD}(K,N)$ spaces

Emanuele Caputo, Nicola Gigli, Enrico Pasqualetto

摘要:

我们提供了一个一般的理论,非塌陷${\sf RCD}$空间上的并行传输获得的存在性和唯一性的结果。我们的理论涵盖了测地线的情况,更一般地说,涵盖了通过充分规则的不定常时间依赖向量场流得到的曲线的情况:我们为这种普遍性付出的代价是,我们不能研究沿着单个这样的曲线的平行输运,而只能研究沿着几乎所有这些曲线的平行输运(在某种意义上,与非光滑设置中的索伯列夫向量微积分和正则拉格朗日流的概念有关)。${\sf ncRCD}$空间的类包含曲率从下有界的有限维亚历山德罗夫空间,因此我们的构造提供了一种在后一种设置中讨论并行传输的方法,而不是Petrunin(1998)提出的方法。这两种方法之间的确切关系尚待了解。

英文摘要:

We provide a general theory for parallel transport on non-collapsed ${\sf RCD}$ spaces obtaining both existence and uniqueness results. Our theory covers the case of geodesics and, more generally, of curves obtained via the flow of sufficiently regular time dependent vector fields: the price that we pay for this generality is that we cannot study parallel transport along a single such curve, but only along almost all of these (in a sense related to the notions of Sobolev vector calculus and Regular Lagrangian Flow in the nonsmooth setting). The class of ${\sf ncRCD}$ spaces contains finite dimensional Alexandrov spaces with curvature bounded from below, thus our construction provides a way of speaking about parallel transport in this latter setting alternative to the one proposed by Petrunin (1998). The precise relation between the two approaches is yet to be understood.

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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