Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2003-03-27
Physical Review E, Vol 71, 016130 (2005)
Physics
Condensed Matter
Statistical Mechanics
8 pages, 5 figures, revtex4
Scientific paper
10.1103/PhysRevE.71.016130
We study fully convex polygons with a given area, and variable perimeter length on square and hexagonal lattices. We attach a weight t^m to a convex polygon of perimeter m and show that the sum of weights of all polygons with a fixed area s varies as s^{-theta_{conv}} exp[K s^(1/2)] for large s and t less than a critical threshold t_c, where K is a t-dependent constant, and theta_{conv} is a critical exponent which does not change with t. We find theta_{conv} is 1/4 for the square lattice, but -1/4 for the hexagonal lattice. The reason for this unexpected non-universality of theta_{conv} is traced to existence of sharp corners in the asymptotic shape of these polygons.
Dhar Deepak
Rajesh R.
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