标题： 广义 pair contact 过程中扩散的持久性作为序参量 显示英文标题

标题： Persistence as Order Parameter in Generalized Pair Contact Process with Diffusion

摘要： PCPD（双接触过程扩散）的普适性类问题以一种替代方法被重新审视。我们研究了Noh和Park引入的一般化双接触扩散过程（GPCPD）中的持久性（Phys. Rev. E 69,016122(2004)）。该模型使我们能够在定向渗流（DP）和PCPD普适性类之间进行插值。我们发现，非零持久性的转变与零数密度的转变发生在相同的参数值上。通过拟合持久性的经验标度律，我们得到了持久性的有限尺寸标度和非临界标度坍塌，并找到了临界指数。尽管GPCPD的动力学标度指数 $z$ 是连续变化的，但关联时间指数 $\nu_\parallel$ 与定向渗流普适性类相匹配。 显示英文摘要

摘要： The question of universality class of pair contact process with diffusion (PCPD) is revisited with an alternative approach. We study persistence in Generalized Pair-Contact Process with diffusion (GPCPD) introduced by Noh and Park, (Phys. Rev. E 69,016122(2004)). This model allows us to interpolate between directed percolation (DP) and PCPD universality classes. We find that transition to nonzero persistence is at same parameter value as transition to zero number density. We obtain finite size scaling and off-critical scaling collapse for persistence and find critical exponents by fitting phenomenological scaling laws to persistence. While the dynamic scaling exponent $z$ varies continuously in GPCPD, the correlation-time exponent $\nu_\parallel$ matches with directed percolation universality class.