Tutte Polynomial of Scale-Free Networks

Tutte Polynomial of Scale-Free Networks
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无标度网络的 Tutte 多项式

DOI:
10.1007/s10955-016-1465-4
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发表时间:
2016-03
影响因子:
1.6
通讯作者:
Hanyuan Deng
Hanyuan Deng
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Hanlin Chen;Hanyuan Deng

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图的 Tutte 多项式,或者等效的 q 状态 Potts 模型配分函数,是一个二变量多项式图不变量,在统计物理学和组合学中都具有相当重要的意义。图的这个不变量的计算通常是 NP 困难的。在本文中,我们重点关注两个迭代增长的无标度网络,它们在现实系统中普遍存在。基于它们的自相似结构,我们主要得到两个无标度网络(格)的Tutte多项式的递推公式,一个是分形的“大世界”,另一个是非分形的但具有小世界性质。此外,我们给出了(x,y)平面上几个特殊点的Tutte多项式的精确解析表达式,例如生成树的数量、非循环方向的数量等。
The Tutte polynomial of a graph, or equivalently theq-state Potts model partition function, is a two-variable polynomial graph invariant of considerable importance in both statistical physics and combinatorics. The computation of this invariant for a graph is NP-hard in general. In this paper, we focus on two iteratively growing scale-free networks, which are ubiquitous in real-life systems. Based on their self-similar structures, we mainly obtain recursive formulas for the Tutte polynomials of two scale-free networks (lattices), one is fractal and “large world”, while the other is non-fractal but possess the small-world property. Furthermore, we give some exact analytical expressions of the Tutte polynomial for several special points at (x,y)-plane, such as, the number of spanning trees, the number of acyclic orientations, etc.
DOI: 10.1103/physreve.65.066122
发表时间: 2002-06-01
期刊: PHYSICAL REVIEW E
影响因子: 2.4
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