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arXiv 2101.01313cond-mat.stat-mech
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混沌元胞自动机中的蝴蝶效应与信息传播的空间结构

Butterfly Effect and Spatial Structure of Information Spreading in a Chaotic Cellular Automaton

Shuwei Liu, J. Willsher, T. Bilitewski, Jinjie Li, A. Smith, K. Christensen, R. Moessner, J. Knolle

摘要:

受多体系统混沌研究的启发,我们构造了一个时空分辨的Hamming距离形式的随机元胞自动机的局部信息扩散测度.这个解相关器是在量子多体系统的背景下研究的时间顺序外相关器的经典版本。针对一维Kauffman元胞自动机,我们提取了我们的解相关器的标度形式与相关的蝴蝶速度$v_b$和速度依赖的李雅普诺夫指数$λ(v)$。后者的存在性在离散经典系统中不是给定的。其次,我们占的行为的解相关器在一个框架的基础上,仅仅是边界的信息传播,包括一个有效的边界随机游走模型产生的完整的功能形式的解相关器。特别是,我们得到了解析结果$v_b$和指数$β$的标度animator $λ(v) \sim μ(v - v_b)^β$,这通常只能得到数值。最后,一个完整的标度崩溃建立解相关器作为一个统一的诊断信息传播。

英文摘要:

Inspired by recent developments in the study of chaos in many-body systems, we construct a measure of local information spreading for a stochastic Cellular Automaton in the form of a spatiotemporally resolved Hamming distance. This decorrelator is a classical version of an Out-of-Time-Order Correlator studied in the context of quantum many-body systems. Focusing on the one-dimensional Kauffman Cellular Automaton, we extract the scaling form of our decorrelator with an associated butterfly velocity $v_b$ and a velocity-dependent Lyapunov exponent $λ(v)$. The existence of the latter is not a given in a discrete classical system. Second, we account for the behaviour of the decorrelator in a framework based solely on the boundary of the information spreading, including an effective boundary random walk model yielding the full functional form of the decorrelator. In particular, we obtain analytic results for $v_b$ and the exponent $β$ in the scaling ansatz $λ(v) \sim μ(v - v_b)^β$, which is usually only obtained numerically. Finally, a full scaling collapse establishes the decorrelator as a unifying diagnostic of information spreading.

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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