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DY: Fachverband Dynamik und Statistische Physik

DY 41: Active Matter 4 - organized by Carsten Beta (Potsdam), Andreas Menzel (Magdeburg) and Holger Stark (Berlin) (joint session DY/BP)

DY 41.3: Talk

Wednesday, March 24, 2021, 11:40–12:00, DYb

Boundary-interior principle for microbial navigation in complex geometries — •Jan Cammann1,2, Fabian Jan Schwarzendahl2,3, Tanya Ostapenko2, Danylo Lavrentovich2, Oliver Bäumchen2,4, and Marco G. Mazza1,21Loughborough University, UK — 2Max Planck Institute for Dynamics and Self-Organization, Göttingen, Germany — 3Heinrich-Heine-Universität, Düsseldorf, Germany — 4University of Bayreuth, Germany

Microswimmers have attracted considerable interest due to the biological and ecological implications of understanding the mechanisms governing their dynamics. The motion of a motile cell appears erratic, and yet the combination of nonequilibrium forces and surfaces can produce striking examples of organization in microbial systems. While our current understanding is based on bulk systems or idealized geometries, it remains elusive how self-organization emerges in complex geometries. In this talk I will describe experiments, analytical and numerical calculations [1] to study the motion of motile cells in complex geometries, and demonstrate that a robust topology of probability flux loops organizes active motion even at the level of a single cell in an isolated habitat. Accounting for the interplay of activity and interfacial forces, we find that the boundary's curvature determines the nonequilibrium probability fluxes. We predict a universal relation between fluxes and global geometric properties that is confirmed by experiments.

[1] J. Cammann, et al. "Boundary-interior principle for microbial navigation in geometric confinement." arXiv:2011.02811 (2020).

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