Counting Lattice Animals in High Dimensions

Details Counting Lattice Animals in High Dimensions Counting Lattice Animals in High Dimensions

2011-06-06

arxiv.org/abs/1106.1078v2

J. Stat. Mech. P09026 (2011)

Physics

Condensed Matter

Statistical Mechanics

18 pages, 7 figures, 6 tables; journal version

Scientific paper

10.1088/1742-5468/2011/09/P09026

We present an implementation of Redelemeier's algorithm for the enumeration of lattice animals in high dimensional lattices. The implementation is lean and fast enough to allow us to extend the existing tables of animal counts, perimeter polynomials and series expansion coefficients in $d$-dimensional hypercubic lattices for $3 \leq d\leq 10$. From the data we compute formulas for perimeter polynomials for lattice animals of size $n\leq 11$ in arbitrary dimension $d$. When amended by combinatorial arguments, the new data suffices to yield explicit formulas for the number of lattice animals of size $n\leq 14$ and arbitrary $d$. We also use the enumeration data to compute numerical estimates for growth rates and exponents in high dimensions that agree very well with Monte Carlo simulations and recent predictions from field theory.

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