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arXiv 1106.4540math.ATmath.GT
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定向构形空间的同调稳定性

Homological stability for oriented configuration spaces

Martin Palmer

摘要:

我们证明了同调稳定序列的“定向配置空间”的配置中的点的数量趋于无穷大。这些空间的配置的n个点在一个连通流形M的维度至少为2,其中“承认一个边界”,标签在一个路径连通空间X,并与一个方向:一个排序的点,直到偶置换。它们是对应的无序位形空间的双覆盖,其中的点没有这个方向。为了证明我们的结果,我们适应的方法,从一份文件的Randal-Williams,证明了同调稳定的无序的情况下。有趣的是,定向构型空间比无序构型空间稳定得更慢:我们得到的稳定性斜率是三分之一,而无序构型空间是二分之一(这是它们各自情况下可能的最佳斜率)。这个结果也可以解释为具有一定扭曲系数的无序位形空间的同调稳定性。

英文摘要:

We prove homological stability for sequences of "oriented configuration spaces" as the number of points in the configuration goes to infinity. These are spaces of configurations of n points in a connected manifold M of dimension at least 2 which 'admits a boundary', with labels in a path-connected space X, and with an orientation: an ordering of the points up to even permutations. They are double covers of the corresponding unordered configuration spaces, where the points do not have this orientation. To prove our result we adapt methods from a paper of Randal-Williams, which proves homological stability in the unordered case. Interestingly the oriented configuration spaces stabilise more slowly than the unordered ones: the stability slope we obtain is one-third, compared to one-half in the unordered case (these are the best possible slopes in their respective cases). This result can also be interpreted as homological stability for unordered configuration spaces with certain twisted coefficients.

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