- Frank Schweitzer:
Active Brownian Particles
with Internal Energy Depot
Traffic and Granular Flow '99:
Social, Traffic, and Granular Dynamics
(Eds. D. Helbing, H. J.
Herrmann, M. Schreckenberg, D. E. Wolf)
Springer, Berlin 2000, pp. 161-172
Active motion relies on the supply of energy. In order to turn passive
into active motion, we need to consider mechanisms of energy take-up,
storage and conversion. A suitable approach which considers both the
energetic and stochastic aspects of active motion is provided by the
model of Active Brownian particles.
For a supercritical supply of energy these particles are able to move
in a ``high velocity'' or active mode, which results in deviation from
the Maxwellian velocity distribution. We investigate different types of
complex motion of active Brownian particles moving in external
potentials. Among the examples are the occurence of stochastic limit
cycles, transitions between Brownian and directed motion, the
``uphill'' motion against the direction of an external force, or the
establishment of positive or negative net currents in a ratchet
potential, dependent on energy supply and stochastic influences.
file: 1.236 MB)
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