Issue
EPL
Volume 82, Number 5, June 2008
Article Number 50004
Number of page(s) 5
Section General
DOI http://dx.doi.org/10.1209/0295-5075/82/50004
Published online 27 May 2008
EPL, 82 (2008) 50004
DOI: 10.1209/0295-5075/82/50004

Resonant activation: Potential vs. temperature fluctuations

J. Iwaniszewski and A. Wozinski

Institute of Physics, Nicolaus Copernicus University - Grudziadzka 5, 87-100 Torun, Poland, EU

jiwanisz@phys.uni.torun.pl

received 29 January 2008; accepted in final form 10 April 2008; published June 2008
published online 27 May 2008

Abstract
The thermal activation over a potential barrier in a stochastically modified system is analyzed. If colored noise perturbs the potential one can observe the famous resonant activation phenomenon. We compare this effect with the results caused by correlated fluctuations of the temperature. For high potential barrier stochastic variations of temperature lead to resonant activation as well. However, for low-barrier or barrierless evolution this effect disappears. We formulate an analytical condition separating these cases and present a physical interpretation of both types of behavior.

PACS
05.40.-a - Fluctuation phenomena, random processes, noise, and Brownian motion.
02.50.Ey - Stochastic processes.
82.20.Uv - Stochastic theories of rate constants.

© EPLA 2008