arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1302.4091math.DS
收藏

平移曲面的模空间上的SL(2,R)-不变概率测度是正则的

SL(2,R)-invariant probability measures on the moduli spaces of translation surfaces are regular

Artur Avila, Carlos Matheus, Jean-Christophe Yoccoz

摘要:

在亏格为$g$的正规化平移曲面的模空间$H_g$中,对于小参数$ρ>0$,考虑具有两个长度为$\leq ρ$的非平行鞍形联络的平移曲面.我们证明了这个子集的$H_g$有测度$o(ρ^2)$ w.r.t.在$SL(2,R)$的自然作用下不变的$H_g$上的任何概率测度。这意味着任何这样的概率测度是经常性的,这是一个重要的财产关系到最近的基本工作埃斯金Kontsevich Zorich的李雅普诺夫指数的KZ-上循环。

英文摘要:

In the moduli space $H_g$ of normalized translation surfaces of genus $g$, consider, for a small parameter $ρ>0$, those translation surfaces which have two non-parallel saddle-connections of length $\leq ρ$. We prove that this subset of $H_g$ has measure $o(ρ^2)$ w.r.t. any probability measure on $H_g$ which is invariant under the natural action of $SL(2,R)$. This implies that any such probability measure is regular, a property which is important in relation with the recent fundamental work of Eskin-Kontsevich-Zorich on the Lyapunov exponents of the KZ-cocycle.

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。

↑