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arXiv 1202.5503cond-mat.stat-mechcond-mat.dis-nn
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上下对称系统中的时间无序

Temporal disorder in up-down symmetric systems

Ricardo Martinez-Garcia, Federico Vazquez, Cristobal Lopez, Miguel A. Muñoz

摘要:

研究了时间无序对上下Z2对称系统的影响。特别是,我们分析了两个著名的家庭的相变:伊辛和广义选民的普遍性类,并仔细检查的后果,把它们放在波动的全球条件下。我们观察到,在两个类的控制参数的变化引起的“时间格里菲斯阶段”(TGP)。这些最近发现的相类似于出现在淬灭空间无序系统中的标准格里菲斯相,但空间和时间的角色被交换。TGP的特征在于参数空间中的宽区域,其中(i)平均首次通过时间与系统大小成代数比例,以及(ii)系统响应(例如磁化率)发散。我们的研究结果证实,TGPs是相当强大的和无处不在的存在时间的障碍。我们的结果在生态学的例子可能的应用进行了讨论。

英文摘要:

The effect of temporal disorder on systems with up-down Z2 symmetry is studied. In particular, we analyze two well-known families of phase transitions: the Ising and the generalized voter universality classes, and scrutinize the consequences of placing them under fluctuating global conditions. We observe that variability of the control parameter induces in both classes "Temporal Griffiths Phases" (TGP). These recently-uncovered phases are analogous to standard Griffiths Phases appearing in systems with quenched spatial disorder, but where the roles of space and time are exchanged. TGPs are characterized by broad regions in parameter space in which (i) mean first-passage times scale algebraically with system size, and (ii) the system response (e.g. susceptibility) diverges. Our results confirm that TGPs are quite robust and ubiquitous in the presence of temporal disorder. Possible applications of our results to examples in ecology are discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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