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北美退伍军人节(Veterans Day),12 日无更新
arXiv 2005.01830math.GTmath.GR
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直角Artin群的自同构群的等差商

Arithmetic Quotients of the Automorphism Group of a Right-Angled Artin Group

Justin Malestein

摘要:

Grunewald和Lubotzky以前证明了自由群的自同构群$\text{Aut}(F_n)$有大量的虚算术子。Looijenga和Grunewald、Larsen、Lubotzky和Malestein证明了映射类群的类似结果。在本文中,我们证明了类似的结果的自同构群的直角Artin群的一个大集合的定义图。作为我们的方法的推论,我们产生了新的虚拟算术代数的$\text{Aut}(F_n)$为$n \geq 4$,其中$k$次幂的所有transvectors作用平凡的一些固定的$k$。因此,对于$k$的某些值,我们推出了$\text{Aut}(F_n)$与由$k$次幂横截生成的子群的商包含非交换自由群.这扩展了Malestein和Putman以及Bridson和Vogtmann的结果。

英文摘要:

It was previously shown by Grunewald and Lubotzky that the automorphism group of a free group, $\text{Aut}(F_n)$, has a large collection of virtual arithmetic quotients. Analogous results were proved for the mapping class group by Looijenga and by Grunewald, Larsen, Lubotzky, and Malestein. In this paper, we prove analogous results for the automorphism group of a right-angled Artin group for a large collection of defining graphs. As a corollary of our methods we produce new virtual arithmetic quotients of $\text{Aut}(F_n)$ for $n \geq 4$ where $k$th powers of all transvections act trivially for some fixed $k$. Thus, for some values of $k$, we deduce that the quotient of $\text{Aut}(F_n)$ by the subgroup generated by $k$th powers of transvections contains nonabelian free groups. This expands on results of Malestein and Putman and of Bridson and Vogtmann.

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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