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arXiv 1806.02147math.PRmath-phmath.MP
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通过Pitman变换研究随机初始条件下的盒球系统动力学

Dynamics of the box-ball system with random initial conditions via Pitman's transformation

Kyoto University(京都大学);University of Tokyo(东京大学)

David A. Croydon, Tsuyoshi Kato, Makiko Sasada, Satoshi Tsujimoto

AI总结:

本文研究随机初始条件下盒球系统动力学,利用Pitman变换分析配置集的可定义性和可逆性,探讨分布不变性、遍历性及概率性质,并引入新的连续盒球系统模型。

摘要:

盒球系统(BBS)由Takahashi和Satsuma于1990年提出,是一种表现出孤子行为的元胞自动机。本文研究了从随机双侧无限粒子配置开始的BBS。Ferrari等人最近展示了密度严格小于1/2的伯努利乘积测度的分布不变性,并给出了更一般的不变测度分解。我们利用最近邻路径编码的变换——'反射过去最大值',该变换由Pitman证明可将布朗运动与三维贝塞尔过程联系起来。我们使用此变换来表征动态可定义且可逆的配置集。我们给出随机初始条件在BBS动态下分布不变的简单充分条件,并在多个自然例子中检验这些条件,同时研究相关变换的遍历性。此外,我们分析了BBS的各种概率性质,如粒子积分电流的渐进行为及标记粒子的行为。最后,对于参数p→1/2的伯努利乘积测度(可视为'高密度'区域),我们考虑的路径编码具有自然的标度极限,这促使引入一个新的连续BBS版本,我们认为其作为动力系统将具有独立价值。

英文摘要:

The box-ball system (BBS), introduced by Takahashi and Satsuma in 1990, is a cellular automaton that exhibits solitonic behaviour. In this article, we study the BBS when started from a random two-sided infinite particle configuration. For such a model, Ferrari et al.\ recently showed the invariance in distribution of Bernoulli product measures with density strictly less than $\frac{1}{2}$, and gave a soliton decomposition for invariant measures more generally. We study the BBS dynamics using the transformation of a nearest neighbour path encoding of the particle configuration given by `reflection in the past maximum', which was famously shown by Pitman to connect Brownian motion and a three-dimensional Bessel process. We use this to characterise the set of configurations for which the dynamics are well-defined and reversible for all times. We give simple sufficient conditions for random initial conditions to be invariant in distribution under the BBS dynamics, which we check in several natural examples, and also investigate the ergodicity of the relevant transformation. Furthermore, we analyse various probabilistic properties of the BBS that are commonly studied for interacting particle systems, such as the asymptotic behavior of the integrated current of particles and of a tagged particle. Finally, for Bernoulli product measures with parameter $p\uparrow\frac12$ (which may be considered the `high density' regime), the path encoding we consider has a natural scaling limit, which motivates the introduction of a new continuous version of the BBS that we believe will be of independent interest as a dynamical system.

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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