论文标题
交换的联系过程
The Contact Process with Switching
论文作者
论文摘要
在本文中,我们在晶格$ \ mathbb {z}^d $上引入了一种类型的切换机制。也就是说,我们允许各个粒子/位点在两种(或更多)类型之间独立于彼此之间的切换,并且不同类型可能表现出特定的感染和恢复动力学。 例如,这种类型的开关可以从生物学中动机,在生物学中,“表型转换”在微生物中很常见。我们的框架包括在“活动”和“休眠”状态之间开关的特殊情况系统(与休眠,CPD的接触过程)以及Broman(2007)引入的随机发展环境(CPREE)中的接触过程。 “标准”多类接触过程(无需类型转换)也可以作为限制案例恢复。 从图形表示构建过程后,我们建立了几种基本属性,这些属性主要类似于经典的接触过程。然后,我们在系统的几个变体之间提供耦合,这特别是产生相变的存在。此外,我们通过提供从耦合参数以及数值和启发式结果获得的严格界限来研究开关参数对系统临界值的影响。最后,我们调查了该过程的缩放限制,因为开关参数趋向于0(慢速切换体制)resp。\ $ \ infty $(快速开关态度)。最后,我们简要讨论了进一步的模型变体和未来研究的问题。
In this paper, we introduce a type switching mechanism for the Contact Process on the lattice $\mathbb{Z}^d$. That is, we allow the individual particles/sites to switch between two (or more) types independently of one another, and the different types may exhibit specific infection and recovery dynamics. Such type switches can eg.\ be motivated from biology, where 'phenotypic switching' is common among micro-organisms. Our framework includes as special cases systems with switches between 'active' and 'dormant' states (the Contact Process with dormancy, CPD), and the Contact Process in a randomly evolving environment (CPREE) introduced by Broman (2007). The 'standard' multi-type Contact Process (without type-switching) can also be recovered as a limiting case. After constructing the process from a graphical representation, we establish several basic properties that are mostly analogous to the classical Contact Process. We then provide couplings between several variants of the system, which in particular yield the existence of a phase transition. Further, we investigate the effect of the switching parameters on the critical value of the system by providing rigorous bounds obtained from the coupling arguments as well as numerical and heuristic results. Finally, we investigate scaling limits for the process as the switching parameters tend to 0 (slow switching regime) resp.\ $\infty$ (fast switching regime). We conclude with a brief discussion of further model variants and questions for future research.