Berlin 2018 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 25: Active Matter DY III (joint session DY/CPP/BP)
BP 25.3: Vortrag
Mittwoch, 14. März 2018, 16:00–16:15, BH-N 243
Active Brownian Particles in Crowded Media — •Jonathan Ónody1, Alexander Liluashvili1, and Thomas Voigtmann1,2 — 1Deutsches Zentrum für Luft- und Raumfahrt e.V, Köln, Deutschland — 2Fachgruppe Physik, Heinrich-Heine Universität, Düsseldorf, Deutschland
We investigate the dynamics of model microswimmers (active Brownian particles) evolving at high densities and in the presence of crowding, i.e., in model porous media, making use of the mode-coupling theory of the glass transition (MCT). The microswimmers are modeled by hard disks in two dimensions undergoing both, translational and rotational diffusion. In addition they posses a constant self-propulsion velocity in their direction of orientation. MCT predicts an idealized active-glass transition, and we discuss the features of the slow dynamics emerging close to that transition. The porous background is treated as a frozen disordered density field. We discuss the structure of the resulting theory, distinguishing between connected and disconnected parts of the correlation functions.
1. Liluashvili, A., Ónody, J., and Voigtmann, Th., Mode Coupling Theory for Active Brownian Particles, Phys. Rev. E in press, arXiv:1707.07373 (2017).
2. Krakoviack, V., Mode-coupling theory for the slow collective dynamics of fluids adsorbed in disordered porous media, Phys. Rev. E 75, 031503 (2007).
3. Götze, W., Complex Dynamics of Glass-Forming Liquids - A Mode-Coupling Theory