Berlin 2018 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 25: Active Matter DY III (joint session DY/CPP/BP)
BP 25.1: Vortrag
Mittwoch, 14. März 2018, 15:30–15:45, BH-N 243
Three-body correlations and conditional forces in suspensions of active hard disks — •Andreas Härtel1, David Richard2, and Thomas Speck2 — 1University of Freiburg, Freiburg, Germany — 2Johannes Gutenberg-University Mainz, Mainz, Germany
Self-propelled Brownian particles show rich out-of-equilibrium physics, but while decades of studying the structure of liquids have build up a deep understanding of passive systems, not much is known about correlations in active suspensions. For this reason, we derive an approximate analytic theory for three-body correlations and forces in systems of active Brownian disks starting from the many-body Smoluchowski equation. Via this theory we discuss properties of conditional three-body forces, an effective swimming speed, and pair distributions. We further test and validate our theory using particle-resolved computer simulations. They allow us to discuss the modeling of active Brownian swimmers with nearly hard interaction potentials. We finally define appropriate parameters to describe active systems and discuss them as a basis for further studies of correlations in active suspensions and for an emerging liquid state-theory.