Abstract
A diffusion-controlled cluster-cluster aggregation system with a source is analysed using the Fock space formalism and diagrammatic perturbation technique. The effective coagulation kernel and equation for low-dimensional cases (d<or=2) are derived. The asymptotic size distribution obeying a power law is obtained for any dimension. The application to the aggregation process of particles undergoing Levy flight is discussed. Through the analysis in this paper, the author clarifies a relation between critical phenomena and a source-enhanced aggregation.