Non universal DLA and exact fractal dimensions

TL;DR

This paper introduces a variant of diffusion-limited aggregation with power-law distributed particle sizes, deriving exact fractal dimensions for broad distributions and confirming results through extensive simulations.

Contribution

It proposes a non-universal DLA model with power-law particle sizes and derives exact fractal dimensions for broad distributions, supported by large-scale simulations.

Findings

Exact fractal dimension for broad distributions derived

Simulation results agree with theoretical predictions

Fractal dimension transitions with distribution width

Abstract

In analogy to recent results on non-universal roughening in surface growth [Lam and Sander, Phys. Rev. Lett. {\bf 69}, 3338 (1992)], we propose a variant of diffusion-limited aggregation ($DLA$) in which the radii of the particles are chosen from a power law distribution. For very broad distributions, the huge particles dominate and the fractal dimension is calculated exactly using a scaling theory. For narrower distributions, it crosses back to DLA. We simulated $1200$ clusters containing up to $200,000$ particles. The fractal dimensions obtained are in reasonable agreement with our theory.