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- W4387579497 abstract "We study ballistic aggregation on a two-dimensional square lattice, where particles move ballistically in between momentum and mass conserving coalescing collisions. Three models are studied based on the shapes of the aggregates: In the first the aggregates remain point particles, in the second they retain the fractal shape at the time of collision, and in the third they assume a spherical shape. The exponents describing the power-law temporal decay of number of particles and energy as well as dependence of velocity correlations on mass are determined using large-scale Monte Carlo simulations. It is shown that the exponents are universal only for the point-particle model. In the other two cases, the exponents are dependent on the initial number density and correlations vanish at high number densities. The fractal dimension for the second model is close to 1.49." @default.
- W4387579497 created "2023-10-13" @default.
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- W4387579497 date "2023-10-12" @default.
- W4387579497 modified "2023-10-14" @default.
- W4387579497 title "Lattice models for ballistic aggregation: Cluster-shape-dependent exponents" @default.
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- W4387579497 doi "https://doi.org/10.1103/physreve.108.044127" @default.
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