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arXiv 1409.3541math.ATmath.GT
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自同构群的同调稳定性

Homological stability for automorphism groups

Nathalie Wahl, Oscar Randal-Williams

摘要:

给定一个家庭的团体承认编织monoidal结构(满足温和的假设),我们构建了一个家庭的空间上的团体的行为和其连通性的收益,通过一个经典的论点奎伦,同调稳定的家庭群体。我们表明,稳定性也与多项式和阿贝尔扭曲系数,没有进一步的假设。这种从群族构造空间族的新方法恢复了稳定群族的经典例子中已知的空间,如对称群、一般线性群和映射类群。通过对经典稳定性结果的系统证明,我们证明了它们在同一类型的系数系下都成立,特别是无需进一步的工作,得到了对称群、辫群、自由群的自同构、酉群、不可可定向曲面的映射类群和三维流形的映射类群的扭系数稳定性定理。我们的构造也可以应用于以前在同调稳定性背景下未考虑过的群族。作为我们工作的一个副产品,我们构建了编织类似的范畴FI有限集和注射有关目前的情况下,并定义多项式函子的背景下,pre-braided幺半范畴。

英文摘要:

Given a family of groups admitting a braided monoidal structure (satisfying mild assumptions) we construct a family of spaces on which the groups act and whose connectivity yields, via a classical argument of Quillen, homological stability for the family of groups. We show that stability also holds with both polynomial and abelian twisted coefficients, with no further assumptions. This new construction of a family of spaces from a family of groups recovers known spaces in the classical examples of stable families of groups, such as the symmetric groups, general linear groups and mapping class groups. By making systematic the proofs of classical stability results, we show that they all hold with the same type of coefficient systems, obtaining in particular without any further work new stability theorems with twisted coefficients for the symmetric groups, braid groups, automorphisms of free groups, unitary groups, mapping class groups of non-orientable surfaces and mapping class groups of 3-manifolds. Our construction can also be applied to families of groups not considered before in the context of homological stability. As a byproduct of our work, we construct the braided analogue of the category FI of finite sets and injections relevant to the present context, and define polynomiality for functors in the context of pre-braided monoidal categories.

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