title: Anomalous velocity distributions in active Brownian suspensions.
abstract: Large-scale simulations and analytical theory have been combined to obtain the nonequilibrium velocity distribution, f(v), of randomly accelerated particles in suspension. The simulations are based on an event-driven algorithm, generalized to include friction. They reveal strongly anomalous but largely universal distributions, which are independent of volume fraction and collision processes, which suggests a one-particle model should capture all the essential features. We have formulated this one-particle model and solved it analytically in the limit of strong damping, where we find that f(v) decays as 1/v for multiple decades, eventually crossing over to a Gaussian decay for the largest velocities. Many particle simulations and numerical solution of the one-particle model agree for all values of the damping.
authors.affiliation: Georg-August-Universität Göttingen, Institut für Theoretische Physik, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany.
authors.forename: Andrea
authors.initials: A
authors.lastname: Fiege
authors.forename: Benjamin
authors.initials: B
authors.lastname: Vollmayr-Lee
authors.forename: Annette
authors.initials: A
authors.lastname: Zippelius