Transport Equations for Subdiffusion with Nonlinear Particle Interaction

Abstract

We show how the nonlinear interaction effects `volume filling' and `adhesion' can be incorporated into the fractional subdiffusive transport of cells and individual organisms. To this end, we use microscopic random walk models with anomalous trapping and systematically derive generic non-Markovian and nonlinear governing equations for the mean concentrations of the subdiffusive cells or organisms. We uncover an interesting interaction between the nonlinearities and the non-Markovian nature of the transport. In the subdiffusive case, this interaction manifests itself in a nontrivial combination of nonlinear terms with fractional derivatives. In the long time limit, however, these equations simplify to a form without fractional operators. This provides an easy method for the study of aggregation phenomena. In particular, this enables us to show that volume filling can prevent "anomalous aggregation," which occurs in subdiffusive systems with a spatially varying anomalous exponent.

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• Anomalous reaction-diffusion equations for linear reactions
• Self-organized anomalous aggregation of particles performing nonlinear and non-Markovian random walk
• Variable-order fractional master equation and clustering of particles: non-uniform lysosome distribution
• A Semi-Markov Algorithm for Continuous Time Random Walk Limit Distributions
• A non-linear subdiffusion model for a cell-cell adhesion in chemotaxis
• Density-Dependence Subdiffusion in Chemotaxis