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BP: Fachverband Biologische Physik
BP 34: Focus Session: Emergent Transport in Active Systems (joint session DY/BP)
BP 34.8: Vortrag
Donnerstag, 12. März 2026, 17:45–18:00, ZEU/0160
Rouse Polymers in Time-dependent Nonequilibrium Baths — •Bhavesh Valecha1 and Abhinav Sharma1, 2 — 1Mathematisch-Naturwissenschaftlich-Technische Fakultät, Institut für Physik, Universität Augsbur, Augsburg, Germany — 2Leibniz-Institut für Polymerforschung Dresden, Institut Theory der Polymere, Dresden, Germany
Directed transport is a characteristic feature of numerous biological systems in response to nutrient and chemical gradients. These signals are often time-dependent owing to the high complexity of interactions in these systems. In this study, we focus on the steady-state behavior of polymeric systems responding to such time varying signals. We model them as ideal Rouse chains submerged in a time-dependent and inhomogeneous nonequilibrium bath, which is described by a spatially and temporally varying self-propulsion wave field experienced by the monomer units. Through a coarse-graining analysis, we show that these chains display rich emergent response to the temporal stimuli as a function of their length and topology. In particular, for slow moving waves, short chains composed of up to 3 monomers drift against self-propulsion wave, whereas, longer chains drift in the direction of the wave. In contrast, for fast moving waves, all chains drift along the wave regardless of their length. Moreover, we find that the star topology displays the highest drift for both slow and fast moving waves. We confirm these analytical predictions with robust numerical simulations, showing that response of polymeric systems to temporal stimuli can be controlled by the topology or the length of the polymer.
Keywords: Chemotaxis; Directed motion; Polymer dynamics; Coarse-graining; Nonequilibrium phenomenon