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

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

2010-03-15

arxiv.org/abs/1003.2908v1

Physics

Condensed Matter

Statistical Mechanics

10 pages, 3 figures

Scientific paper

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 \mu^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 \mu and the bending rigidity J. In the limit \mu -> 0, the mean perimeter has the asymptotic behaviour \avg{t}/4 \sqrt{A} \simeq 1 - K(J)/(\ln \mu)^2 + O (\mu/ \ln \mu) . 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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