Physics – Condensed Matter – Statistical Mechanics
Scientific paper
1998-12-04
The Annals of Probability, 27, 1833-1850 (1999)
Physics
Condensed Matter
Statistical Mechanics
18 pages, LaTeX file, no figure
Scientific paper
We consider the problem of bootstrap percolation on a three dimensional lattice and we study its finite size scaling behavior. Bootstrap percolation is an example of Cellular Automata defined on the $d$-dimensional lattice $\{1,2,...,L\}^d$ in which each site can be empty or occupied by a single particle; in the starting configuration each site is occupied with probability $p$, occupied sites remain occupied for ever, while empty sites are occupied by a particle if at least $\ell$ among their $2d$ nearest neighbor sites are occupied. When $d$ is fixed, the most interesting case is the one $\ell=d$: this is a sort of threshold, in the sense that the critical probability $p_c$ for the dynamics on the infinite lattice ${\Bbb Z}^d$ switches from zero to one when this limit is crossed. Finite size effects in the three-dimensional case are already known in the cases $\ell\le 2$: in this paper we discuss the case $\ell=3$ and we show that the finite size scaling function for this problem is of the form $f(L)={\mathrm{const}}/\ln\ln L$. We prove a conjecture proposed by A.C.D. van Enter.
Cerf Raphaël
Cirillo Emilio N. M.
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