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arXiv 2301.04066cond-mat.stat-mechmath-phmath.MP
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完全非对称简单排它过程的多种群推广

Multi-species generalization of the totally asymmetric simple exclusion process

Ali Zahra

摘要:

一维排斥过程最早出现在70年代,从那时起吸引了许多不同领域的关注:随机过程,出平衡统计物理学,以及最近的可积系统。虽然可以从不同方面描述单个物种的完全不对称简单排除过程(TASEP)的技术状态为成熟的,但当存在多个相互作用物种时知之甚少。使用工具,从可积系统和流体动力学在第一位和随机过程在第二位,这项工作试图研究一个新版本的模型与不同种类的粒子的行为具有层次动力学,取决于任意参数。虽然伯格方程著名的流体动力学极限的TASEP与一个单一的物种,我们提出了一个对应的耦合系统的PDE代表的流体动力学极限的模型与两个物种。这些偏微分方程的解决方案显示了丰富的现象学的解决方案,最好的特点是通过潜在的正常模式。这个两种群系统可以作为一个玩具模型来研究具有开放边界的驱动扩散系统。使用prostitics,我们提出的结果表明,一个一般原则的边界诱导相图的系统与多个耦合驱动的守恒量,从而推广的极值电流原理已知的情况下,一个单一的驱动量。使用可积性工具,我们开发了一种形式主义,允许计算的有限时间概率分布的粒子位置上的一维晶格,因此,推广已知的结果TASEP和其他多物种模型。最后,我们研究的行为和影响的一个单一的第二类杂质最初位于两个不同密度的第一类粒子的区域之间的界面。

英文摘要:

Exclusion processes in one dimension first appeared in the 70s and have since dragged much attention from communities in different domains: stochastic processes, out-of-equilibriums statistical physics, and more recently integrable systems. While the state of the art for a single species totally asymmetric simple exclusion process (TASEP) can be described, from different aspects as mature, much less is known when multiple interacting species are present. Using tools from integrable systems and hydrodynamics in the first place and stochastic processes in the second place, this work attempts to study the behavior of a novel version of the model with different species of particles having hierarchical dynamics that depend on arbitrary parameters. While Burger's equation famously represents the hydrodynamic limit of TASEP with a single species, we present a counterpart coupled system of PDE representing the hydrodynamic limit for a model with two species. The solutions of these PDEs display a rich phenomenology of solutions best characterized through the underlying normal modes. This system with two species can be used as a toy model for studying driven diffusive systems with open boundaries. Using heuristics, we present results suggesting a general principle governing the boundary-induced phase diagram of systems with multiple coupled driven conserved quantities, generalizing thus the extremal current principle known for the case of a single driven quantity. Using integrability tools, we develop a formalism allowing the computation of the finite-time probability distribution of particle positions on the 1D lattice, generalizing therefore known results for TASEP and other multi-species models. We finally study the behavior and the impact of a single second-class impurity initially located at the interface separating two regions of different densities of first-class particles.

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