Volume 79, Number 1, July 2007
Article Number 10005
Number of page(s) 6
Section General
Published online 15 June 2007
EPL, 79 (2007) 10005
DOI: 10.1209/0295-5075/79/10005

Brownian motion: Anomalous response due to noisy chaos

D. Speer, R. Eichhorn and P. Reimann

Universität Bielefeld, Fakultät für Physik - 33615 Bielefeld, Germany

received 12 March 2007; accepted in final form 24 May 2007; published July 2007
published online 15 June 2007

We predict three different, quite unusual transport properties of an underdamped Brownian particle in the form of current and force of opposite signs. Their origin is a subtle interplay between the stability of coexisting attractors, noise-induced metastability, and transient chaos. Numerical simulations are complemented by intuitive explanations of the basic mechanism and analytical approximations.

05.45.-a - Nonlinear dynamics and chaos.
05.40.-a - Fluctuation phenomena, random processes, noise, and Brownian motion.
05.60.-k - Transport processes.

© Europhysics Letters Association 2007