Regensburg 2019 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 3: Active Matter A (joint session DY/CPP)

DY 3.2: Talk

Monday, April 1, 2019, 10:00–10:15, H20

Approximating microswimmer dynamics by active Brownian motion: Energetics and efficiency — •Jannik Ehrich and Marcel Kahlen — Institut für Physik, Carl von Ossietzky Universität, 26111 Oldenburg, Germany

We consider the dynamics of a microswimmer and show that they can be approximated by active Brownian motion. The swimmer is modeled by coupled overdamped Langevin equations with periodic driving. We compare the energy dissipation of the real swimmer to that of the active Brownian motion model finding that the latter can massively underestimate the complete dissipation. This discrepancy is related to the inability to infer the full dissipation from partial observation of the complete system. We introduce an efficiency that measures how much of the dissipated energy is spent on forward propulsion.

[1] J. Ehrich and M. Kahlen, arXiv:1809.07235 (2018)