Branched Growth with $η\approx 4$ Walkers

Details Branched Growth with $η\approx 4$ Walkers Branched Growth with $η\approx 4$ Walkers

2001-05-02

arxiv.org/abs/cond-mat/0105047v1

Physics

Condensed Matter

Statistical Mechanics

6 pages, 1 figure

Scientific paper

10.1103/PhysRevE.65.021104

Diffusion-limited aggregation has a natural generalization to the "$\eta$-models", in which $\eta$ random walkers must arrive at a point on the cluster surface in order for growth to occur. It has recently been proposed that in spatial dimensionality $d=2$, there is an upper critical $\eta_c=4$ above which the fractal dimensionality of the clusters is D=1. I compute the first order correction to $D$ for $\eta <4$, obtaining $D=1+{1/2}(4-\eta)$. The methods used can also determine multifractal dimensions to first order in $4-\eta$.

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