Study of the multi-species annihilating random walk transition at zero branching rate - cluster scaling behavior in a spin model

Abstract

Numerical and theoretical studies of a one-dimensional spin model with locally broken spin symmetry are presented. The multi-species annihilating random walk transition found at zero branching rate previously is investigated now concerning the cluster behaviour of the underlying spins. Generic power law behaviors are found, besides the phase transition point, also in the active phase with fulfillment of the hyperscaling law. On the other hand scaling laws connecting bulk- and cluster exponents are broken - a possibility in no contradiction with basic scaling assumptions because of the missing absorbing phase.

7 pages, 6 figures, final form to appear in PRE Nov.2003

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• Critical behaviour of a tumor growth model - Directed Percolation with a mean-field flavour
• One-dimensional spin-anisotropic kinetic Ising model subject to quenched disorder