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arXiv 1710.06151math.GT
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Gromov顺从局部化在测地流中的应用

Applying Gromov's Amenable Localization to Geodesic Flows

Gabriel Katz

摘要:

设$M$是一个紧致光滑的带边界黎曼$n$ -流形.本文将Gromov的顺从局部化技术与Poincaré对偶相结合,研究了球面切丛空间$SM$上的{ \sf遍历一般}测地流.这种流动产生了$SM$的分层,由丰富的通用组合学控制。分层反映了流动轨迹与边界$\partial(SM)$相切的方式。具体地说,我们得到较低的估计,这些流量生成的层的任何给定的余维$k$的赋范同源$H_k(M; \mathbf R)$和$H_k(DM; \mathbf R)$,其中$DM = M\cup_{\partial M} M$表示的两倍的$M$方面的连通组件。这里的范数是同调中的{ \sf单纯半范数}。$M$上的度量越复杂,$SM$和$S(DM)$的层次就越多。因此,我们的估计可以看作是有边流形上测地线的Morse不等式的类似。证明了赋范同调空间对$M$上的全局$k$ -{ \sf凸}遍历泛度量的存在性构成了障碍.我们还证明了,知道$M$上的测地线散射映射,使它有可能重建的测地线空间的分层拓扑类型,以及在$SM$上的可修改的本地化庞加莱对偶算子。

英文摘要:

Let $M$ be a compact smooth Riemannian $n$-manifold with boundary. We combine Gromov's amenable localization technique with the Poincaré duality to study the {\sf traversally generic} geodesic flows on $SM$, the space of the spherical tangent bundle. Such flows generate stratifications of $SM$, governed by rich universal combinatorics. The stratification reflects the ways in which the flow trajectories are tangent to the boundary $\partial(SM)$. Specifically, we get lower estimates of the numbers of connected components of these flow-generated strata of any given codimension $k$ in terms of the normed homology $H_k(M; \mathbf R)$ and $H_k(DM; \mathbf R)$, where $DM = M\cup_{\partial M} M$ denotes the double of $M$. The norms here are the {\sf simplicial semi-norms} in homology. The more complex the metric on $M$ is, the more numerous the strata of $SM$ and $S(DM)$ are. %So one may regard our estimates as analogues of the Morse inequalities for the geodesics on manifolds with boundary. It turns out that the normed homology spaces form obstructions to the existence of globally $k$-{\sf convex} traversally generic metrics on $M$. We also prove that knowing the geodesic scattering map on $M$ makes it possible to reconstruct the stratified topological type of the space of geodesics, as well as the amenably localized Poincaré duality operators on $SM$.

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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