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arXiv 1102.0141cond-mat.stat-mechmath-phmath.MP
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有向伊辛链的动力学

Dynamics of the directed Ising chain

Claude Godreche

摘要:

Glauber对伊辛链随时间变化的统计量的研究被推广到每个自旋受其最近邻自旋影响不相等的情况。动力学的不对称性意味着细致平衡条件的失效。单个自旋改变其状态的速率的函数形式受到关于伊辛链平衡测度的全局平衡条件的约束。局部磁化强度、等时和二时关联函数以及对外磁场的线性响应服从线性方程组,并显式求解。这些量的行为和相关性和响应函数之间的关系进行了分析,在稳态和零温度标度制度。在稳定状态下,当不对称的幅度超过临界值时,发生关联函数的两种行为之间的转变,结果是极限波动耗散比从不存在不对称的平衡态的值1连续衰减到该临界值的0。在零温度下,在非对称动力学下,系统失去了它的临界特性,但保留了粗化系统的许多特征。

英文摘要:

The study by Glauber of the time-dependent statistics of the Ising chain is extended to the case where each spin is influenced unequally by its nearest neighbours. The asymmetry of the dynamics implies the failure of the detailed balance condition. The functional form of the rate at which an individual spin changes its state is constrained by the global balance condition with respect to the equilibrium measure of the Ising chain. The local magnetization, the equal-time and two-time correlation functions and the linear response to an external magnetic field obey linear equations which are solved explicitly. The behaviour of these quantities and the relation between the correlation and response functions are analyzed both in the stationary state and in the zero-temperature scaling regime. In the stationary state, a transition between two behaviours of the correlation function occurs when the amplitude of the asymmetry crosses a critical value, with the consequence that the limit fluctuation-dissipation ratio decays continuously from the value 1, for the equilibrium state in the absence of asymmetry, to 0 for this critical value. At zero temperature, under asymmetric dynamics, the system loses its critical character, yet keeping many of the characteristic features of a coarsening system.

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