Exact solution of diffusion limited aggregation in a narrow cylindrical geometry

Details Exact solution of diffusion limited aggregation in a narrow cylindrical geometry Exact solution of diffusion limited aggregation in a narrow cylindrical geometry

1998-02-04

arxiv.org/abs/cond-mat/9802048v1

Physics

Condensed Matter

Statistical Mechanics

18 pages RevTex, 6 eps figures

Scientific paper

10.1103/PhysRevE.58.4716

The diffusion limited aggregation model (DLA) and the more general dielectric breakdown model (DBM) are solved exactly in a two dimensional cylindrical geometry with periodic boundary conditions of width 2. Our approach follows the exact evolution of the growing interface, using the evolution matrix E, which is a temporal transfer matrix. The eigenvector of this matrix with an eigenvalue of one represents the system's steady state. This yields an estimate of the fractal dimension for DLA, which is in good agreement with simulations. The same technique is used to calculate the fractal dimension for various values of eta in the more general DBM model. Our exact results are very close to the approximate results found by the fixed scale transformation approach.

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