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  • Title: Generalized fractional diffusion equations for subdiffusion in arbitrarily growing domains.
    Author: Angstmann CN, Henry BI, McGann AV.
    Journal: Phys Rev E; 2017 Oct; 96(4-1):042153. PubMed ID: 29347596.
    Abstract:
    The ubiquity of subdiffusive transport in physical and biological systems has led to intensive efforts to provide robust theoretical models for this phenomena. These models often involve fractional derivatives. The important physical extension of this work to processes occurring in growing materials has proven highly nontrivial. Here we derive evolution equations for modeling subdiffusive transport in a growing medium. The derivation is based on a continuous-time random walk. The concise formulation of these evolution equations requires the introduction of a new, comoving, fractional derivative. The implementation of the evolution equation is illustrated with a simple model of subdiffusing proteins in a growing membrane.
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