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arXiv 1102.5348cond-mat.stat-mech
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成环动力学

Kinetics of Ring Formation

E. Ben-Naim, P. L. Krapivsky

摘要:

我们研究了环的可逆聚合。在这个随机过程中,两个单体结合,因此,两个不相交的环可以合并成一个化合物环,或者,一个单环可以分裂成两个片段环。这种聚集-碎裂过程表现出一种具有有限环相和巨环相的渗滤过渡,在有限环相中,所有环都具有微观长度,在巨环相中,宏观环占整个质量的有限部分。有趣的是,虽然巨环的总质量是一个确定性的量,但它们的总数和大小却是随机的量。宏观环的尺寸分布是普遍的,尽管这种分布的跨度随时间而增加。此外,巨环的平均数量与系统大小成比例关系。我们介绍了一个洗牌算法的有效模拟环的形成过程,并提出了数值验证的理论预测。

英文摘要:

We study reversible polymerization of rings. In this stochastic process, two monomers bond and as a consequence, two disjoint rings may merge into a compound ring, or, a single ring may split into two fragment rings. This aggregation-fragmentation process exhibits a percolation transition with a finite-ring phase in which all rings have microscopic length and a giant-ring phase where macroscopic rings account for a finite fraction of the entire mass. Interestingly, while the total mass of the giant rings is a deterministic quantity, their total number and their sizes are stochastic quantities. The size distribution of the macroscopic rings is universal, although the span of this distribution increases with time. Moreover, the average number of giant rings scales logarithmically with system size. We introduce a card-shuffling algorithm for efficient simulation of the ring formation process, and present numerical verification of the theoretical predictions.

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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