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Regensburg 2016 – scientific program

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BP: Fachverband Biologische Physik

BP 47: Posters - Active Matter

BP 47.2: Poster

Wednesday, March 9, 2016, 17:00–19:00, Poster C

Dynamical density functional theory for hard, active disks — •Josua Grawitter and Holger Stark — Institut für Theoretische Physik, Technische Universität Berlin, 10623 Berlin, Germany

We study a collection of self-propelled, active particles using a modified dynamical density functional theory (DDFT) in two dimensions. DDFT provides an ensemble description of hard-sphere interactions in colloidal systems. It therefore gives insight into statistical properties which would otherwise require extensive Brownian dynamics simulation.

When active particles are placed in a harmonic trapping potential, we observe nonequilibrium steady states, which were previously noted by Pototsky and Stark using different methods [1]. Switching to the co-moving and -rotating reference frame of a single particle produces the radial-orientational distribution function of the liquid. Using this model, we can statistically predict the relative orientations and positions of active particles close to each other.

[1] A. Pototsky and H. Stark, Europhys. Lett. 98, 50004 (2012).

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