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The critical behaviors of bond percolation on a family of Sierpinski carpets (SCs) are studied. We distinguish two sorts of bonds and assign them to two kinds of occupation probabilities. We develop the usual choice of cell on translationally invariant lattices and choose suitable cells to cover the fractal lattice. On this basis we construct a new real-space renormalization group (RG) transformation scheme and use it to solve the percolation problems. Phase transitions of percolation on such fractals with infinite order of ramification are found at non-trivial bond occupation probabilities. The percolation threshold values, correlation length exponents ν, and the RG flow diagrams are obtained. The flow diagrams are remarkably similar to those of Ising model and Potts model. This agrees with the correspondence between the pure bond percolation and Potts model. 相似文献
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本文通过Frenkel Kontorova(FK)模型评述了凝聚态物理中的一个重要课题:不公度相和公度 不公度(CI)相变。论述主要集中在一维情形,对不公度相和CI相变的概念、物理图象、产生机制、研究背景、研究目标和意义进行了必要的介绍;概述了早期、近期和现代研究过程中一些典型的基本理论和方法;对标准FK模型及原子间势为凸函数的FK模型、经典非凸FK模型、FK模型的量子效应、一维双原子链FK模型、FK模型向二维和三维的推广、CI相变的有限温度效应等专题的研究进展作了概述,并指出了一些有待进一步探讨的课题。 相似文献
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我们认为秦元勋同志的文章在哲学上的一大缺点就是离开物质去讨论时空性质的倾向. 我们觉得,讨论时间空间的一切性质,都必须紧密地与物质和物质的运动相连系,空间时间的性质部是通过物质运动的规律去认识的.所以,关于时间空间性质的讨论,必须从我们所掌握的物质的各种运动形式的规律作为出发点.作者“根本不涉及光的传播”,“不再和光学、电磁学直接联系”去谈空间时间的性质,在我们看来,讨论时空的性质,不仅要与光学、电磁学等密切联系,而且恐怕理论上的重大进展要等到实验上新的突破之后,才能实现. 也许上是由于作者的上述倾向,使得他借以… 相似文献
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Wu study a symmetric 3-state 27-vertex model and summarize three ways con-tributing to obtaining information of a higher-spin (more-vertex) model in terms of lower-spin (less-vertex) models. We find that this model is equivalent to a symmet-ric 2-state 8-vertex model or an arbitrary 3-state spin models on Kagome lattice in different eases. And 21 exact critical lines and a multicritical point (add something that I cannot recognize) are obtained in ten-dimensional weight space. 相似文献