Global persistence exponent for nonequilibrium critical dynamics

Global persistence exponent for nonequilibrium critical dynamics
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DOI:
10.1103/physrevlett.77.3704
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发表时间:
1996-10-28
影响因子:
8.6
通讯作者:
Sire, C
Sire, C
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Majumdar, SN;Bray, AJ;Sire, C

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定义了非平衡临界现象的“持续指数”θ。它描述了概率,p(t)类似于t(-theta),即在从无序状态猝灭到临界点之后的时间间隔t内,全局序参量没有改变符号。这个指数是在平均场理论中计算的,在O(n)模型的n =无穷大极限中,在n = 4 - d中的一阶,以及对于1D伊辛模型。对二维伊辛模型进行了数值计算。我们认为,θ是一个新的独立指数。
A ''persistence exponent'' theta is defined for nonequilibrium critical phenomena. It describes the probability, p(t) similar to t(-theta), that the global order parameter has not changed sign in the time interval t following a quench to the critical point from a disordered state. This exponent is calculated in mean-field theory, in the n = infinity limit of the O(n) model, to first order in epsilon = 4 - d, and for the 1D Ising model. Numerical results are obtained for the 2D Ising model. We argue that theta is a new independent exponent.