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arXiv 1012.1433math.ATmath.GR
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系数为同调表示的自由群的自同构的稳定上同调

The stable cohomology of automorphisms of free groups with coefficients in the homology representation

Oscar Randal-Williams

摘要:

本文研究了Aut(F_n)和Out(F_n)的上同调,其系数在模\wedge^q H,\wedge H^*,Sym^q H或Sym^q H^* 中,其中H是Out(F_n)-模,通过交换自由群F_n得到.由于概念上不清楚的原因,取H及其相关模中的系数比取H^* 及其相关模中的系数要简单得多。基于单连通背景空间所标记的图空间的有理同调稳定性定理,给出了这类群在低度下的稳定积分计算,并进一步模猜想了这类群在所有度下的稳定有理计算.

英文摘要:

We study the cohomology of Aut(F_n) and Out(F_n) with coefficients in the modules \wedge^q H, \wedge H^*, Sym^q H or Sym^q H^*, where H is the Out(F_n)-module obtained by abelianising the free group F_n. For reasons which are not conceptually clear, taking coefficients in H and its related modules behaves in a far less trivial way than taking coefficients in H^* and its related modules. Based on a conjectural homology stability theorem for spaces of graphs labeled by a simply connected background space, we give a stable integral calculation of these groups in low degrees, and modulo a further conjecture a stable rational calculation in all degrees.

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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