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DY: Fachverband Dynamik und Statistische Physik

DY 17: Physics of Physarum polycephalum and Other Slime Molds - Joint Focus Session (BP/DY) organized by Hans-Günther Döbereiner

DY 17.10: Vortrag

Dienstag, 21. März 2017, 12:45–13:00, SCH A251

Poroelastic two-phase model for droplets of Physarum polycephalum with free boundaries — •Dirk Alexander Kulawiak¹, Jakob Löber¹, Markus Bär², and Harald Engel¹ — ¹Institut für Theoretische Physik, TU Berlin, Hardenbergstrasse 36, 10623 Berlin, Germany — ²Physikalisch-Technische Bundesanstalt, Abbestrasse 2-12, 10587 Berlin, Germany

The model describes the cytoskeleton as an active viscoelastic solid phase coupled to a passive viscous fluid representing the cytosol. The active tension in the solid phase depends on the concentration of a regulating agent that is advected by the fluid phase. In [1] it was shown that under rigid boundary conditions that impose a fixed shape, this model reproduces a large variety of mechano-chemical patterns; these include traveling and standing waves, turbulent patterns, rotating spirals and antiphase oscillations in line with experimental observations of contraction patterns in protoplasmic droplets of Physarum polycephalum. Here we present a free-boundary approach to the model of the moving droplet. We find deformations of the droplet boundary as well as oscillatory and chaotic changes in the droplets position.