Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2008-09-19
J.Phys.A41:495003,2008
Physics
Condensed Matter
Statistical Mechanics
11 pages, 8 figures
Scientific paper
10.1088/1751-8113/41/49/495003
Since the work of Creutz, identifying the group identities for the Abelian Sandpile Model (ASM) on a given lattice is a puzzling issue: on rectangular portions of Z^2 complex quasi-self-similar structures arise. We study the ASM on the square lattice, in different geometries, and a variant with directed edges. Cylinders, through their extra symmetry, allow an easy determination of the identity, which is a homogeneous function. The directed variant on square geometry shows a remarkable exact structure, asymptotically self-similar.
Caracciolo Sergio
Paoletti Guglielmo
Sportiello Andrea
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