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arXiv 0806.0543cond-mat.stat-mechhep-lat
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Tethered Monte Carlo:计算有效势而无临界减速

Tethered Monte Carlo: computing the effective potential without critical slowing down

L. A. Fernandez, V. Martin-Mayor, D. Yllanes

摘要:

我们提出了拴系蒙特卡罗,一个简单的,通用的方法计算的有效潜力的序参量(亥姆霍兹自由能)。这种形式主义是基于一个新的统计系综,密切相关的微磁之一,但与扩展的配置空间(通过克罗伊茨恶魔)。正则平均值的外部磁场的任意值计算没有额外的模拟。该方法是把工作在二维伊辛模型,其中存在的精确结果,使我们能够执行高精度的检查。一个相当奇特的功能,我们的实施,它采用了本地的大都市算法,是完全没有,在错误内,临界减速磁观测。事实上,高精度的结果提出了大到L=1024的晶格。

英文摘要:

We present Tethered Monte Carlo, a simple, general purpose method of computing the effective potential of the order parameter (Helmholtz free energy). This formalism is based on a new statistical ensemble, closely related to the micromagnetic one, but with an extended configuration space (through Creutz-like demons). Canonical averages for arbitrary values of the external magnetic field are computed without additional simulations. The method is put to work in the two dimensional Ising model, where the existence of exact results enables us to perform high precision checks. A rather peculiar feature of our implementation, which employs a local Metropolis algorithm, is the total absence, within errors, of critical slowing down for magnetic observables. Indeed, high accuracy results are presented for lattices as large as L=1024.

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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