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arXiv 2103.12402math.GRmath.DSmath.MG
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可解李群作用的上同调消失与参数刚性,II

Vanishing of cohomology and parameter rigidity of actions of solvable Lie groups, II

Hirokazu Maruhashi

摘要:

设$M\stackrel{ρ_0}{\curvearrowleft}S$是连通单连通可解李群$S$在闭流形$M$上的一个$C^\infty$局部自由作用.粗略地说,$ρ_0$是参数刚性的,如果$S$对与$ρ_0$具有相同轨道的$M$的任何$C^\infty$局部自由作用是$C^\infty$与$ρ_0$共轭的。本文证明了关于参数刚性的两类结果。首先,设$G$是一个连通半单李群,其实秩中心至少为$2$,不含紧因子,也不含单因子,局部同构于$\mathrm{SO}_0(n,1)$ $(n\geq2)$或$\mathrm{SU}(n,1)$ $(n\geq2)$,且$Γ$是$G$中的一个不可约余紧格.令$G=KAN$是Iwasawa分解。证明了右乘作用$Γ\backslash G\curvearrowleft AN$是参数刚性的.证明的三个主要成分之一是Pansu和Kleiner-Leeb关于非紧型黎曼对称空间的拟等距的刚性定理。其次,我们证明了如果$M\stackrel{ρ_0}{\curvearrowleft}S$是参数刚性的,则具有一定系数的$ρ_0$的轨道叶理的第零和第一上同调必为零.这与作者[可解李群作用的上同调和参数刚性的消失]中的结果是部分相反的。托波尔。21(1)(2017),157-191],其中我们看到了参数刚性的充分条件,即具有各种系数的第一上同调消失。

英文摘要:

Let $M\stackrel{ρ_0}{\curvearrowleft}S$ be a $C^\infty$ locally free action of a connected simply connected solvable Lie group $S$ on a closed manifold $M$. Roughly speaking, $ρ_0$ is parameter rigid if any $C^\infty$ locally free action of $S$ on $M$ having the same orbits as $ρ_0$ is $C^\infty$ conjugate to $ρ_0$. In this paper we prove two types of result on parameter rigidity. First let $G$ be a connected semisimple Lie group with finite center of real rank at least $2$ without compact factors nor simple factors locally isomorphic to $\mathrm{SO}_0(n,1)$ $(n\geq2)$ or $\mathrm{SU}(n,1)$ $(n\geq2)$, and let $Γ$ be an irreducible cocompact lattice in $G$. Let $G=KAN$ be an Iwasawa decomposition. We prove that the action $Γ\backslash G\curvearrowleft AN$ by right multiplication is parameter rigid. One of the three main ingredients of the proof is the rigidity theorems of Pansu and Kleiner-Leeb on the quasiisometries of Riemannian symmetric spaces of noncompact type. Secondly we show, if $M\stackrel{ρ_0}{\curvearrowleft}S$ is parameter rigid, then the zeroth and first cohomology of the orbit foliation of $ρ_0$ with certain coefficients must vanish. This is a partial converse to the results in the author's [Vanishing of cohomology and parameter rigidity of actions of solvable Lie groups. Geom. Topol. 21(1) (2017), 157-191], where we saw sufficient conditions for parameter rigidity in terms of vanishing of the first cohomology with various coefficients.

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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