arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0811.3917math.DS
收藏

非奇异同胚的几乎连续轨道等价

Almost continuous orbit equivalence for non-singular homeomorphisms

Alexandre I. Danilenko, Andrés del Junco

摘要:

令$X$和$Y$是波兰空间,具有非原子Borel测度$μ$和$ν$的完全支持。设$T$和$S$是$(X,μ)$和$(Y,ν)$的遍历非奇异同胚,且具有连续Radon-Nikodym导数.假设它们要么都是$III_1$类型,要么都是$III_λ$、$0<λ<1$类型,在$III_λ$的情况下,还假设两个“拓扑渐近值域”(在文章中定义)都是$\logλ\cdot\Bbb Z$。则存在全测度的不变稠密$G_δ$ -子集$X'\subset X$和$Y'\subset Y$以及一个非奇异同胚$ϕ: X' \to Y'$,它是$T|_{X'}$和$S|_{Y'}$之间的轨道等价,即对所有$x \in X'$都有$ϕ\{T^{i}x\} = \{S^{i}x\}$.此外,Radon-Nikodym导数$dν\circϕ/dμ$在$X'$上是连续的,并且令$S' = ϕ^{-1}S ϕ$,我们有$Tx= {S'}^{n(x)}x$和$S' = T^{m(x)}x$,其中$n$和$m$在$X'$上是连续的。

英文摘要:

Let $X$ and $Y$ be Polish spaces with non-atomic Borel measures $μ$ and $ν$ of full support. Suppose that $T$ and $S$ are ergodic non-singular homeomorphisms of $(X,μ)$ and $(Y,ν)$ with continuous Radon-Nikodym derivatives. Suppose that either they are both of type $III_1$ or that they are both of type $III_λ$, $0<λ<1$ and, in the $III_λ$ case, suppose in addition that both `topological asymptotic ranges' (defined in the article) are $\logλ\cdot\Bbb Z$. Then there exist invariant dense $G_δ$-subsets $X'\subset X$ and $Y'\subset Y$ of full measure and a non-singular homeomorphism $ϕ: X' \to Y'$ which is an orbit equivalence between $T|_{X'}$ and $S|_{Y'}$, that is $ϕ\{T^{i}x\} = \{S^{i}x\}$ for all $x \in X'$. Moreover the Radon-Nikodym derivative $dν\circϕ/dμ$ is continuous on $X'$ and, letting $S' = ϕ^{-1}S ϕ$ we have $Tx= {S'}^{n(x)}x$ and $S' = T^{m(x)}x$ where $n$ and $m$ are continuous on $X'$.

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。

↑