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arXiv 1503.05175math.DS
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无穷测度保持系统中小集的返回和首中时分布

Return- and hitting-time distributions of small sets in infinite measure preserving systems

Simon Rechberger, Roland Zweimüller

摘要:

在保持无穷测度$μ$的循环遍历动力系统中,研究了小集$E_{k}$与$μ(E_{k})\rightarrow0$的返回时间和首中时分布的收敛性.一些在有限测度情况下很容易的性质在这种零递归设置中被打破。然而,在存在的均匀集$Y$的游荡率定期变化的指标$1-α$与$α\in(0,1]$,有一个缩放功能适用于所有子集的$Y$。在这种情况下,我们证明了$E_{k}$的收益分布收敛当且仅当相应的命中时间分布收敛,并且我们得到了两个极限定律之间的显式关系。这一结果的一些后果进行了讨论。特别地,这导致收敛到$\mathcal{E}^{1/α}\,\mathcal{G}_α$的改进的充分条件,其中$\mathcal{E}$和$\mathcal{G}_α$是独立的随机变量,$\mathcal{E}$呈指数分布,$\mathcal{G}% _α$遵循$α$(和$\mathcal{G}_{1}:=1$)阶的单侧稳定律。同样的原理也揭示了在原型零递归区间映射的双曲周期点上出现的极限定律(与上述不同)。我们也得出了类似的结果,几乎复发$α=0$的情况下。

英文摘要:

We study convergence of return- and hitting-time distributions of small sets $E_{k}$ with $μ(E_{k})\rightarrow0$ in recurrent ergodic dynamical systems preserving an infinite measure $μ$. Some properties which are easy in finite measure situations break down in this null-recurrent setup. However, in the presence of a uniform set $Y$ with wandering rate regularly varying of index $1-α$ with $α\in(0,1]$, there is a scaling function suitable for all subsets of $Y$. In this case, we show that return distributions for the $E_{k}$ converge iff the corresponding hitting time distributions do, and we derive an explicit relation between the two limit laws. Some consequences of this result are discussed. In particular, this leads to improved sufficient conditions for convergence to $\mathcal{E}^{1/α}\,\mathcal{G}_α$, where $\mathcal{E}$ and $\mathcal{G}_α$ are independent random variables, with $\mathcal{E}$ exponentially distributed and $\mathcal{G}% _α$ following the one-sided stable law of order $α$ (and $\mathcal{G}_{1}:=1$). The same principle also reveals the limit laws (different from the above) which occur at hyperblic periodic points of prototypical null-recurrent interval maps. We also derive similar results for the barely recurrent $α=0$ case.

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