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arXiv 0706.0571cond-mat.stat-mech
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完全非对称简单排它过程中总占据数的功率谱

Power Spectra of the Total Occupancy in the Totally Asymmetric Simple Exclusion Process

D. A. Adams, R. K. P Zia, B. Schmittmann

摘要:

完全非对称排斥过程作为一个可解的、适用范围广泛的模型体系,在非平衡相变理论中具有标志性的地位。在这里,我们专注于1维开晶格上的粒子总数的时间依赖性,以及它的功率谱。使用蒙特卡罗模拟和分析方法,我们探讨其行为在不同的特征制度。在最大电流相和共存线上(高/低密度相之间),功率谱显示代数衰减,指数分别为-1.62和-2.00。在高/低密度相的深处,我们发现了明显的\emph{oscillations},其阻尼成幂律。这种行为可以理解为受驱动的偏置扩散与保守的噪声在体。

英文摘要:

As a solvable and broadly applicable model system, the totally asymmetric exclusion process enjoys iconic status in the theory of non-equilibrium phase transitions. Here, we focus on the time dependence of the total number of particles on a 1-dimensional open lattice, and its power spectrum. Using both Monte Carlo simulations and analytic methods, we explore its behavior in different characteristic regimes. In the maximal current phase and on the coexistence line (between high/low density phases), the power spectrum displays algebraic decay, with exponents -1.62 and -2.00, respectively. Deep within the high/low density phases, we find pronounced \emph{oscillations}, which damp into power laws. This behavior can be understood in terms of driven biased diffusion with conserved noise in the bulk.

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