Berlin 2008 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 4: Brownian motion and transport

DY 4.4: Vortrag

Montag, 25. Februar 2008, 15:00–15:15, MA 004

The diffusion coefficient of nonlinear Brownian motion — •Benjamin Lindner — Max-Planck-Institute for the Physics of Complex Systems, Dresden, Germany

Nonequilibrium biological systems like moving cells or bacteria have been phenomenologically described by Langevin equations of Brownian motion in which the friction function depends on the particle's velocity in a nonlinear way. In my talk I present an exact result for the diffusion coefficient of such a nonlinear Brownian motion for simple cases (Rayleigh friction, SET model, and powerlaw friction). I discuss under which conditions the diffusion can be minimized at a finite noise intensity. REFS: Lindner New J. Phys. 9 , 136 (2007); Lindner J. Stat. Phys. (in press, 2007)