Simulating the contact process in heterogeneous environments.

Simulating the contact process in heterogeneous environments.
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模拟异构环境中的接触过程。

DOI:
10.1103/physreve.77.051125
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发表时间:
2008
期刊:
Physical review. E, Statistical, nonlinear, and soft matter physics
影响因子:
--
通讯作者:
Fallert SV
Fallert SV
中科院分区:
--
文献类型:
--
作者:
Fallert SV

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研究了非均质环境中的一维接触过程(CP)--由两种不同恢复率的位点组成的二元链。有人认为,常用的随机顺序蒙特卡罗模拟方法,采用离散的时间概念是不忠实的接触过程中的异构环境中的速率。因此,该算法的修改沿着与两个可选的连续时间的实现进行了分析。后两种方法是伊辛模型模拟中使用的折叠方式的修改版本和基于修改的优先级队列的方法。它表明,常用的(但不正确的,因为我们相信)离散时间方法产生不同的临界阈值从所有其他算法考虑。最低的差距在频谱中的刘维尔时间演化算子的CP提供了一个估计的临界速率,支持这些研究结果的最小尺寸缩放。此外,性能测试表明在异构速率的系统中使用连续时间方法的优势。这一结果有望有助于分析的CP在无序系统中的异构率,其中模拟是一项具有挑战性的任务,由于很长的弛豫时间。
The one-dimensional contact process (CP) in a heterogeneous environment—a binary chain consisting of two types of site with different recovery rates—is investigated. It is argued that the commonly used random-sequential Monte Carlo simulation method which employs a discrete notion of time is not faithful to the rates of the contact process in a heterogeneous environment. Therefore, a modification of this algorithm along with two alternative continuous-time implementations are analyzed. The latter two are an adapted version of the-fold way used in Ising model simulations and a method based on a modified priority queue. It is demonstrated that the commonly used (but incorrect as we believe) discrete-time method yields a different critical threshold from all other algorithms considered. Finite-size scaling of the lowest gap in the spectrum of the Liouville time-evolution operator for the CP gives an estimate of the critical rate which supports these findings. Further, a performance test indicates an advantage in using the continuous-time methods in systems with heterogeneous rates. This result promises to help in the analysis of the CP in disordered systems with heterogeneous rates in which simulation is a challenging task due to very long relaxation times.
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影响因子: 8.6
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致编辑的信:基本接触过程的精确关键指数
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