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arXiv 1003.2908cond-mat.stat-mech
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固定面积变周长的凸和柱凸格点多边形的渐近性质

Asymptotic behaviour of convex and column-convex lattice polygons with fixed area and varying perimeter

Mithun K Mitra, Gautam I Menon, R Rajesh

摘要:

研究了当权μ^t \exp [- Jb]与周长为t且弯曲为b的二维格点多边形(凸和列凸)的膨胀相.平均周长作为逸度μ和弯曲刚度J的函数计算。在极限μ-> 0时,平均周长具有渐近行为\avg{t} /4 \sqrt{A} \simeq 1 - K(J)/(\ln μ)^2 + O(μ/ \ln μ)。常数K(J)被发现是相同的两种类型的多边形,这表明自避免多边形也应该表现出相同的渐近行为。

英文摘要:

We study the inflated phase of two dimensional lattice polygons, both convex and column-convex, with fixed area A and variable perimeter, when a weight μ^t \exp[- Jb] is associated to a polygon with perimeter t and b bends. The mean perimeter is calculated as a function of the fugacity μand the bending rigidity J. In the limit μ-> 0, the mean perimeter has the asymptotic behaviour \avg{t}/4 \sqrt{A} \simeq 1 - K(J)/(\ln μ)^2 + O (μ/ \ln μ) . The constant K(J) is found to be the same for both types of polygons, suggesting that self-avoiding polygons should also exhibit the same asymptotic behaviour.

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