Regensburg 2025 – scientific programme

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BP: Fachverband Biologische Physik

BP 17: Poster Session II

BP 17.8: Poster

Tuesday, March 18, 2025, 18:00–20:30, P4

Analysis of Wall-Torques for Rod-Shaped Active Particles — •Merle Duchêne, Sascha Lambert, and Stefan Klumpp — University of Göttingen, Institute for the Dynamics of Complex Systems, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany

The motility of living things and synthetic self-propelled objects is often described using Active Brownian particle models. To account for interactions with complex environments, this model can be expanded with empirical forces or torques, such as those describing their alignment with an obstacle or wall after a collision. Here, we evaluate the quality of these empirical models by comparing their output predictions with trajectories of rigid rod-shaped active particles that scatter sterically at a flat wall. Specifically, we analyze the torque reorienting the rod-shaped particle and compare it to predictions from a phenomenological model. We employ a classical least-squares method to evaluate the instantaneous torque and identify essential model parameters. In addition, a Bayesian inference procedure can be applied to construct the posterior distribution of plausible model parameters which provides a complementary perspective to the least-squares analysis.

Keywords: Active Brownian Particles; Wall scattering dynamics; Numerical Simulation