Dresden 2017 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 53: Posters - Active Matter

DY 53.6: Poster

Donnerstag, 23. März 2017, 17:00–19:30, P1A

Confined active Brownian particles: A comparison between simulations and analytical results — •Shibananda Das, Gerhard Gompper, and Roland G. Winkler — Theoretical Soft Matter and Biophysics (ICS 2/ IAS 2), Forschungszentrum Jülich, D-52425 Jülich, Germany

A thorough understanding of the relevant physical mechanisms of self-propelled objects, their collective behavior, and their properties in external fields and confinement, has promising applications in technology and health-care. This can be tackled with simplified and generic models of microswimmers such as the active Brownian particle (ABP) description. This model has been exploited to characterize the phase behavior and the non-equilibrium properties of active systems. We analyze the distribution function of active Brownian particles in confinement by computer simulations and analytical approach. We apply the well-known ABP model of a spherical colloid with a given propulsion direction which changes in a diffusive manner by an independent stochastic process. In addition, we study a somewhat more simplified theoretical model with independent stochastic processes along the Cartesian coordinates of the active velocity corresponding to a Gaussian, but non-Markovian, colored-noise process for the active velocity. Especially, we consider an ABP confined in a harmonic potential, which can be solved exactly. For non-harmonic potentials, we apply the Unified Colored Noise Approximation (UCNA) to find an approximate solution. The comparison between the simulation and analytical result reveals the applicability of the applied approximation schemes.