Vortrag von Prof. Thomas Voigtmann, Universität Düsseldorf, im Rahmen des Greifswalder Physikalischen Kolloquiums.
We discuss a dense system of active Brownian particles (ABP) as a simple model system to study the collective behavior of microswimmers. The particles posses a randomly changing internal sense of orientation and undergo Brownian dynamics modified by an ``active'' driving along that orientation. The dynamics depends on two relevant parameters: the driving velocity $v_0$ and the rotational diffusion coefficient $D_r$. The latter is varied over a wide range to mimic the effects of persistence in the swimming direction.
Using the integration-through transients formalism and an extended mode-coupling theory of the glass transition (ABP-MCT), we study how the glass-transition dynamics depends on these parameters. We discuss under which circumstances the mapping of the system to an FDT-breaking one with an effective enhanced diffusivity (set by $v_0^2/D_r$) works and when it fails. In particular we address how the relaxation times and the glass transition point change (differently) upon varying the two parameters of the active motion.