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arXiv math/0606297math.PR
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圆覆盖的动力学模型:布朗运动和泊松更新

Dynamical models for circle covering: Brownian motion and Poisson updating

Johan Jonasson, Jeffrey E. Steif

摘要:

我们考虑Dvoretzky的经典问题的随机区间覆盖的单位圆,后者已完全解决了L。谢普在第一模型中,区间的中心执行独立的布朗运动,并且在第二模型中,区间的位置根据独立的泊松过程来更新,其中长度为$\ell$的区间以速率$\ell^{-α}$更新,其中$α\ge0$是参数。对于布朗运动模型,我们的结果的一个特殊情况是:如果$n$第h区间的长度为$c/n$,则存在不动点不被覆盖的时刻当且仅当$c<2$,并且存在圆不被完全覆盖的时刻当且仅当$c<3$ .对于Poisson更新模型,我们用$c<α$和$c<α+1$得到了类似的结果.我们还计算了其中一些问题的异常时间集的豪斯多夫维度。

英文摘要:

We consider two dynamical variants of Dvoretzky's classical problem of random interval coverings of the unit circle, the latter having been completely solved by L. Shepp. In the first model, the centers of the intervals perform independent Brownian motions and in the second model, the positions of the intervals are updated according to independent Poisson processes where an interval of length $\ell$ is updated at rate $\ell^{-α}$ where $α\ge0$ is a parameter. For the model with Brownian motions, a special case of our results is that if the length of the $n$th interval is $c/n$, then there are times at which a fixed point is not covered if and only if $c<2$ and there are times at which the circle is not fully covered if and only if $c<3$. For the Poisson updating model, we obtain analogous results with $c<α$ and $c<α+1$ instead. We also compute the Hausdorff dimension of the set of exceptional times for some of these questions.

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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