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The action dimension of Artin groups
Geometriae Dedicata ( IF 0.5 ) Pub Date : 2019-12-23 , DOI: 10.1007/s10711-019-00502-9
Giang Le

The action dimension of a discrete group G is the minimum dimension of a contractible manifold, which admits a proper G -action. In this paper, we study the action dimension of general Artin groups. The main result is that if an Artin group with the nerve L of dimension n for $$n \ne 2$$ n ≠ 2 satisfies the $$K(\pi , 1)$$ K ( π , 1 ) -Conjecture and the top cohomology group of L with $${\mathbb {Z}}$$ Z -coefficients is trivial, then the action dimension of the Artin group is less than or equal to $$(2n + 1)$$ ( 2 n + 1 ) . For $$n = 2$$ n = 2 , we need one more condition on L to get the same inequality; that is the fundamental group of L is generated by r elements where r is the rank of $$H_1(L, {\mathbb {Z}})$$ H 1 ( L , Z ) .

中文翻译:

Artin团体的行动维度

离散群 G 的动作维数是允许适当 G 动作的可收缩流形的最小维数。在本文中,我们研究了一般 Artin 群体的行动维度。主要结果是,如果一个 Artin 群的神经元为 L,神经元为 L,$$n \ne 2$$ n ≠ 2 满足 $$K(\pi , 1)$$ K ( π , 1 ) -Conjecture 和L 的顶上同调群 $${\mathbb {Z}}$$ Z -coefficients 是平凡的,那么 Artin 群的动作维度小于或等于 $$(2n + 1)$$ ( 2 n + 1)。对于 $$n = 2$$ n = 2 ,我们还需要 L 上的一个条件来获得相同的不等式;即 L 的基本群由 r 个元素生成,其中 r 是 $$H_1(L, {\mathbb {Z}})$$ H 1 ( L , Z ) 的秩。
更新日期:2019-12-23
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