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arXiv 1208.4237math.KTmath.GRmath.GTmath.OA
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图空间、边界群胚与粗Baum-Connes猜想

Spaces of Graphs, Boundary Groupoids and the Coarse Baum-Connes Conjecture

Martin Finn-Sell, Nick Wright

摘要:

我们介绍了一个新的变种的粗Baum-Connes猜想,旨在解决粗断开的度量空间称为边界粗Baum-Connes猜想。我们证明了这一猜想的许多粗糙不连通的空间是已知的反例粗糙鲍姆-康纳斯猜想。特别地,我们给出了这个猜想的几何证明的图空间,具有大围长和有界顶点度。然后,我们连接的边界猜想粗Baum-Connes猜想使用同调的方法,这使我们能够展示所有当前一致离散的反例粗Baum-Connes猜想在一个基本的方式。

英文摘要:

We introduce a new variant of the coarse Baum-Connes conjecture designed to tackle coarsely disconnected metric spaces called the boundary coarse Baum-Connes conjecture. We prove this conjecture for many coarsely disconnected spaces that are known to be counterexamples to the coarse Baum-Connes conjecture. In particular, we give a geometric proof of this conjecture for spaces of graphs that have large girth and bounded vertex degree. We then connect the boundary conjecture to the coarse Baum-Connes conjecture using homological methods, which allows us to exhibit all the current uniformly discrete counterexamples to the coarse Baum-Connes conjecture in an elementary way.

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