arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1708.08147math.PR
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通过空间运动洗牌

Shuffling cards by spatial motion

Persi Diaconis, Soumik Pal

摘要:

我们提出了一个洗牌的模型,一包卡,传播的点在一个正方形的桌子上,反复收集本地随机点,然后向一个随机的方向传播。然后,通过按其递增的$x$坐标值排列牌来获得牌的洗牌。当桌子上有$m$卡时,我们证明了这种随机排序在时间上是混合的$O\left(\log m\right)$。显式常数进行评估时,$m$卡的位置演变为一个有趣的$2m$维不可逆的反射跳跃扩散的时间扩散限制。我们的主要技术涉及使用多维Skorokhod映射的双重反射在$[0,1]^2$在采取离散到连续的限制。极限计算是基于平面布朗运动和贝塞尔过程的性质。

英文摘要:

We propose a model of card shuffling where a pack of cards, spread as points on a square table, are repeatedly gathered locally at random spots and then spread towards a random direction. A shuffling of the cards is then obtained by arranging the cards by their increasing $x$-coordinate values. When there are $m$ cards on the table we show that this random ordering gets mixed in time $O\left(\log m\right)$. Explicit constants are evaluated in a diffusion limit when the position of $m$ cards evolves as an interesting $2m$-dimensional non-reversible reflected jump diffusion in time. Our main technique involves the use of multidimensional Skorokhod maps for double reflections in $[0,1]^2$ in taking the discrete to continuous limit. The limiting computations are then based on the planar Brownian motion and properties of Bessel processes.

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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