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Felix Kümmel: „Shape dependence of active Brownian swimmers”
Universität Stuttgart

Dynamic Density Functional Theory (DDFT) has proved to be a reliable tool to study colloidal systems. However, a fundamental assumption is that a grand-canonical free-energy functional is employed to generate the thermodynamic driving forces. Using one-dimensional hard rods as a model system, one can analyze the validity of this key assumption for a certain class of situations and show that unphysical self-interactions of the density fields, arising from coupling to a particle reservoir, are responsible for the excessively fast relaxation predicted by the theory. Several possible schemes to suppress these effects are presented.

In the second part of the talk a framework is introduced that allows to obtain predictions for the rheological properties of colloidal systems using DDFT.

Results for hard disks under simple shear are presented and show excellent agreement with simulations.