Radial DLA: two fractal dimensions and deviations from self-similarity

Details Radial DLA: two fractal dimensions and deviations from self-similarity Radial DLA: two fractal dimensions and deviations from self-similarity

2001-09-23

arxiv.org/abs/cond-mat/0109426v2

Physics

Condensed Matter

Statistical Mechanics

4 pages, 7 figures. Accepted for publication, Phys. Rev. Letters

Scientific paper

When suitably rescaled, the distribution of the angular gaps between branches of off-lattice radial DLA is shown to approach a size-independent limit. The power-law expected from an asymptotic fractal dimension D=1.71 arises only for very small angular gaps, which occur only for clusters significantly larger than one million particles. Intermediate size gaps exhibit an effective dimension around 1.66, even for cluster sizes going to infinity. They dominate the distribution for clusters with less than a million particles. The largest gap approaches a finite limit extremely slowly, with a correction of order M^{-0.17}, where M is the cluster mass.

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