Anomalous Fluctuation Relations

Research output: Contribution to book/Conference proceedings/Anthology/ReportChapter in book/Anthology/ReportContributedpeer-review

Contributors

  • Rainer Klages - , Queen Mary University of London (Author)
  • Aleksei V. Chechkin - , NASU - Kharkov Institute of Physics and Technology (Author)
  • Peter Dieterich - , Institute of Physiology (Author)

Abstract

We study fluctuation relations (FRs) for dynamics that are anomalous, in the sense that the diffusive properties strongly deviate from the ones of standard Brownian motion. We first briefly review the concept of transient work FRs for stochastic dynamics modeled by the ordinary Langevin equation. We then introduce three generic types of dynamics generating anomalous diffusion: Lévy flights, long-time correlated Gaussian stochastic processes, and time-fractional kinetics. By combining Langevin and kinetic approaches, we calculate the work probability distributions in the simple nonequilibrium situation of a particle subject to a constant force. This allows us to check the transient FR for anomalous dynamics. We find a new form of FRs, which is intimately related to the validity of fluctuation-dissipation relations. Analogous results are obtained for a particle in a harmonic potential dragged by a constant force. We argue that these findings are important for understanding fluctuations in experimentally accessible systems. As an example, we discuss the anomalous dynamics of biological cell migration both in equilibrium and in nonequilibrium under chemical gradients.

Details

Original languageEnglish
Title of host publicationNonequilibrium Statistical Physics of Small Systems
PublisherWiley-VCH
Pages259-282
Number of pages24
ISBN (electronic)9783527658701
ISBN (print)9783527410941
Publication statusPublished - 11 Feb 2013
Peer-reviewedYes

Keywords

ASJC Scopus subject areas

Keywords

  • Anomalous dynamics, Cell migration, Gaussian noise, Lévy flights, Time-fractional kinetics, Transient fluctuation relations