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arXiv 0711.0573cond-mat.stat-mech
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Sierpinski垫上最外层顶点可能有空位的二聚覆盖

Dimer coverings on the Sierpinski gasket with possible vacancies on the outmost vertices

Shu-Chiuan Chang, Lung-Chi Chen

摘要:

我们提出了Sierpinski垫片$SG_d(n)$上的二聚体$N_d(n)$的数量在阶段$n$与尺寸$d$等于二,三,四或五,其中一个最外的顶点不被覆盖时,顶点$v(n)$的数量是一个奇数。每个位点的双原子分子的吸收熵定义为$S_{SG_d}=\lim_{n \to \infty} \ln N_d(n)/v(n)$,对于$SG_2(n)$计算为$\ln(2)/3$。精确地得到了具有$d=2$和$b=3,4,5$的广义Sierpinski垫片$SG_{d,b}(n)$上二聚体的个数.它们的熵分别等于$\ln(6)/7$、$\ln(28)/12$、$\ln(200)/18$。熵的上限和下限是根据$SG_d(n)$与$d=3,4,5$在某个阶段的结果推导出来的。由于这些界限之间的差异随着计算阶段的增加而迅速收敛到零,因此可以使用$d=3,4,5$计算$S_{SG_d}$的数值,其有效数字精确度超过一百位。

英文摘要:

We present the number of dimers $N_d(n)$ on the Sierpinski gasket $SG_d(n)$ at stage $n$ with dimension $d$ equal to two, three, four or five, where one of the outmost vertices is not covered when the number of vertices $v(n)$ is an odd number. The entropy of absorption of diatomic molecules per site, defined as $S_{SG_d}=\lim_{n \to \infty} \ln N_d(n)/v(n)$, is calculated to be $\ln(2)/3$ exactly for $SG_2(n)$. The numbers of dimers on the generalized Sierpinski gasket $SG_{d,b}(n)$ with $d=2$ and $b=3,4,5$ are also obtained exactly. Their entropies are equal to $\ln(6)/7$, $\ln(28)/12$, $\ln(200)/18$, respectively. The upper and lower bounds for the entropy are derived in terms of the results at a certain stage for $SG_d(n)$ with $d=3,4,5$. As the difference between these bounds converges quickly to zero as the calculated stage increases, the numerical value of $S_{SG_d}$ with $d=3,4,5$ can be evaluated with more than a hundred significant figures accurate.

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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