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arXiv 0704.2619cond-mat.stat-mech
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域系统的统计行为

Statistical Behavior Of Domain Systems

Diego Luis Gonzalez, Gabriel Tellez

摘要:

研究了两个非平衡系统的统计行为。第一种是准一维气体,在外场的作用下,两种粒子沿相反方向运动。第二种是具有近邻相互作用的一维自旋系统,也受到外部驱动力的影响。这两个系统都表现出动态标度与域的形成。这些域的统计行为进行比较与模型的基础上合并的随机游走和相互作用的随机游走。我们发现,气体和自旋系统的标度域尺寸分布很好地拟合的Wigner surroundings,这使我们探索这些系统和随机矩阵的循环正交系综之间的可能联系。然而,对畴边缘的关联函数的研究表明,无论是气体体系还是自旋体系中畴的统计行为,都不能完全用圆正交系综来描述,也不能用其他模型如聚结随机行走和相互作用随机行走来描述。然而,我们发现,一个简单的模型的独立的时间间隔更密切地描述了这些系统中形成的域的统计行为。

英文摘要:

We study the statistical behavior of two out of equilibrium systems. The first one is a quasi one-dimensional gas with two species of particles under the action of an external field which drives each species in opposite directions. The second one is a one-dimensional spin system with nearest neighbor interactions also under the influence of an external driving force. Both systems show a dynamical scaling with domain formation. The statistical behavior of these domains is compared with models based on the coalescing random walk and the interacting random walk. We find that the scaling domain size distribution of the gas and the spin systems is well fitted by the Wigner surmise, which lead us to explore a possible connection between these systems and the circular orthogonal ensemble of random matrices. However, the study of the correlation function of the domain edges, show that the statistical behavior of the domains in both gas and spin systems, is not completely well described by circular orthogonal ensemble, nor it is by other models proposed such as the coalescing random walk and the interacting random walk. Nevertheless, we find that a simple model of independent intervals describe more closely the statistical behavior of the domains formed in these systems.

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