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arXiv 1105.0982cond-mat.stat-mech
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实际物理系统中的不连续渗流相变

Discontinuous percolation transitions in real physical systems

Y. S. Cho, B. Kahng

摘要:

我们研究了溶胶-凝胶转变的扩散限制簇聚集模型中的不连续逾渗转变(PT),作为一个真实物理系统的例子,其中聚集事件的数量被视为在系统中占据的键的数量。当粒子是布朗运动时,团簇速度取决于团簇大小,如$v_s \sim s^η$与$η=-0.5$,较大的团簇由于其较小的迁移率而与其他团簇碰撞的概率较小。因此,簇在其大小的增长方面被有效地更多地抑制。然后,通过合并那些被抑制的团簇,巨团簇的尺寸急剧增加,表现出不连续的PT。通过控制参数$η$研究了三临界行为,并通过引入非对称Smoluchowski方程确定了三临界点。

英文摘要:

We study discontinuous percolation transitions (PT) in the diffusion-limited cluster aggregation model of the sol-gel transition as an example of real physical systems, in which the number of aggregation events is regarded as the number of bonds occupied in the system. When particles are Brownian, in which cluster velocity depends on cluster size as $v_s \sim s^η$ with $η=-0.5$, a larger cluster has less probability to collide with other clusters because of its smaller mobility. Thus, the cluster is effectively more suppressed in growth of its size. Then the giant cluster size increases drastically by merging those suppressed clusters near the percolation threshold, exhibiting a discontinuous PT. We also study the tricritical behavior by controlling the parameter $η$, and the tricritical point is determined by introducing an asymmetric Smoluchowski equation.

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