Persistence in Cluster--Cluster Aggregation

Abstract

Persistence is considered in diffusion--limited cluster--cluster aggregation, in one dimension and when the diffusion coefficient of a cluster depends on its size $s$ as $D(s)\sim s^{\gamma }$. The empty and filled site persistences are defined as the probabilities, that a site has been either empty or covered by a cluster all the time whereas the cluster persistence gives the probability of a cluster to remain intact. The filled site one is nonuniversal. The empty site and cluster persistences are found to be universal, as supported by analytical arguments and simulations. The empty site case decays algebraically with the exponent ${\theta }_E=2/(2-\gamma )$. The cluster persistence is related to the small $s$ behavior of the cluster size distribution and behaves also algebraically for $0\le \gamma <2$ while for $\gamma <0$ the behavior is stretched exponential. In the scaling limit $t\to \infty$ and $K(t)\to \infty$ with $t/K(t)$ fixed the distribution of intervals of size $k$ between persistent regions scales as $n(k;t)=K^{-2}f(k/K)$, where $K(t)\sim t^{\theta }$ is the average interval size and $f(y)=e^{-y}$. For finite $t$ the scaling is poor for $k\ll t^z$, due to the insufficient separation of the two length scales: the distances between clusters, $t^z$, and that between persistent regions, $t^{\theta }$. For the size distribution of persistent regions the time and size dependences separate, the latter being independent of the diffusion exponent $\gamma$ but depending on the initial cluster size distribution.

14 pages, 12 figures, RevTeX, submitted to Phys. Rev. E

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• Particle Survival and Polydispersity in Aggregation
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Cited by in corpus (5)

• Complex networks created by aggregation
• Persistence properties of a system of coagulating and annihilating random walkers
• Persistence in systems with conserved order parameter
• Dynamical Critical Behaviors of the Ising Spin Chain: Swendsen-Wang and Wolff Algorithms
• Cluster persistence in one-dimensional diffusion--limited cluster--cluster aggregation