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arXiv 0705.1320cond-mat.stat-mech
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稳态定向渗流的有限尺寸标度

Finite-size scaling of directed percolation in the steady state

Hans-Karl Janssen, Sven Lubeck, Olaf Stenull

摘要:

近年来,人们对平衡体系中有限尺寸标度的理解取得了很大进展。在这里,我们研究有限尺寸标度在非平衡系统的情况下,定向渗流(DP),这已成为非平衡相变到吸收状态的范例,在上临界尺寸以上,在和以下。我们研究了DP的有限尺寸标度行为的分析和数值考虑其稳定状态产生的均匀恒定的外部源的有限边长L的d维超立方体的周期性边界条件附近的体临界点。特别地,我们利用重整化场论研究了序参量及其高阶矩。我们推导出有限尺寸标度形式的单圈计算的时刻。此外,我们引入和计算的序参量矩的比率,发挥了类似的作用,在分析有限尺寸标度吸收非平衡过程中的平衡系统中的著名的Binder累积量,特别是,提供了一个新的签名的DP普适类。为了补充我们的分析工作,我们进行蒙特卡罗模拟,证实我们的分析结果。

英文摘要:

Recently, considerable progress has been made in understanding finite-size scaling in equilibrium systems. Here, we study finite-size scaling in non-equilibrium systems at the instance of directed percolation (DP), which has become the paradigm of non-equilibrium phase transitions into absorbing states, above, at and below the upper critical dimension. We investigate the finite-size scaling behavior of DP analytically and numerically by considering its steady state generated by a homogeneous constant external source on a d-dimensional hypercube of finite edge length L with periodic boundary conditions near the bulk critical point. In particular, we study the order parameter and its higher moments using renormalized field theory. We derive finite-size scaling forms of the moments in a one-loop calculation. Moreover, we introduce and calculate a ratio of the order parameter moments that plays a similar role in the analysis of finite size scaling in absorbing nonequilibrium processes as the famous Binder cumulant in equilibrium systems and that, in particular, provides a new signature of the DP universality class. To complement our analytical work, we perform Monte Carlo simulations which confirm our analytical results.

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