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arXiv 0705.1913cond-mat.stat-mech
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自重叠作为伊辛模型的一种分析方法

Self-overlap as a method of analysis in Ising models

A. Ferrera, B. Luque, L. Lacasa, E. Valero

摘要:

损伤扩展方法(DS)提供了一个有用的工具来获得2D伊辛模型的热力学和稳定性的分析结果--在许多其他模型中--但是它遭受了其结果中的模糊性和大的计算成本。在本文中,我们提出了一种替代方法,所谓的自重叠方法,在随后的时间步长测量的关联函数的研究的基础上,系统向其平衡发展。应用马尔可夫和平均场近似的二维伊辛系统,我们得到的热力学分析和数值结果,同意与预期的行为。我们还提供了一些分析结果的系统的稳定性。由于只需要研究系统的一个复制品,这种方法似乎没有困扰DS的模糊性。它似乎在数值上更有效,在分析上更简单。

英文摘要:

The damage spreading method (DS) provided a useful tool to obtain analytical results of the thermodynamics and stability of the 2D Ising model --amongst many others--, but it suffered both from ambiguities in its results and from large computational costs. In this paper we propose an alternative method, the so called self-overlap method, based on the study of correlation functions measured at subsequent time steps as the system evolves towards its equilibrium. Applying markovian and mean field approximations to a 2D Ising system we obtain both analytical and numerical results on the thermodynamics that agree with the expected behavior. We also provide some analytical results on the stability of the system. Since only a single replica of the system needs to be studied, this method would seem to be free from the ambiguities that afflicted DS. It also seems to be numerically more efficient and analytically simpler.

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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