Download:
- Frank Schweitzer:
-
Active Motion of Brownian Particles
- in:
-
Stochastic Processes in Physics, Chemistry and Biology
(Eds. J. A. Freund, T. Pöschel)
Lecture Notes in Physics vol. 557, Springer, Berlin 2000
- Abstract:
-
We investigate the dynamics of Brownian particles which are active in
the sense that they take up energy from the environment, which can be
stored in a internal energy depot and used for different activities.
As one example, we consider the generation of a self-consistent field,
which in turn affects the movement of the particles. The dynamics can
in this case be described by coupled reaction-diffusion equations, but
will be more efficiently simulated by means of Langevin equations for
the active particles. As another example, we discuss the active motion
of Brownian particles which can be described by a non-linear,
velocity-dependent friction function. Provided a supercritical supply
of energy, the active particles are able to perform non-trivial motion,
such as ``uphill'' motion against the direction of an external force,
or motion on a stochastic limit cycle.
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