BPCPPDYSOE21 – wissenschaftliches Programm
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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: Vortrag
Mittwoch, 24. März 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. Mazza1,2 — 1Loughborough 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).