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arXiv 0705.1967cond-mat.stat-mechcond-mat.dis-nn
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非均匀无序环境中接触过程的超临界级数展开

Supercritical series expansion for the contact process in heterogeneous and disordered environments

C. J. Neugebauer, S. N. Taraskin

摘要:

本文用非均匀无序点阵中一维接触过程的生存概率的超临界级数展开法求出了临界点的轨迹和临界指数$β$。通过考虑具有不同恢复率和相同传输率的二进制规则和不规则节点格来模拟异质性和无序性。两种分析方法的基础上嵌套Padé逼近和偏微分逼近的情况下使用的扩展相对于两个变量(两个回收率)的临界值和临界指数的评估。非均相系统的临界指数与均相接触过程的临界指数非常接近,从而证实了周期性非均相环境中的接触过程属于定向渗流普适类。相反,无序系统似乎具有连续变化的临界指数。

英文摘要:

The supercritical series expansion of the survival probability for the one-dimensional contact process in heterogeneous and disordered lattices is used for the evaluation of the loci of critical points and critical exponents $β$. The heterogeneity and disorder are modeled by considering binary regular and irregular lattices of nodes characterized by different recovery rates and identical transmission rates. Two analytical approaches based on Nested Padé approximants and Partial Differential approximants were used in the case of expansions with respect to two variables (two recovery rates) for the evaluation of the critical values and critical exponents. The critical exponents in heterogeneous systems are very close to those for the homogeneous contact process thus confirming that the contact process in periodic heterogeneous environment belongs to the directed percolation universality class. The disordered systems, in contrast, seem to have continuously varying critical exponents.

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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