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Original Research ARTICLE Provisionally accepted The full-text will be published soon. Notify me

Front. Phys. | doi: 10.3389/fphy.2019.00143

Langevin dynamics driven by a telegraphic active noise

Jaegon Um1,  Taegun Song1 and  Jae-Hyung Jeon1*
  • 1Department of Physics, Pohang University of Science and Technology, South Korea

Self-propelled or active particles are referred to as the entities which exhibit anomalous transport violating the fluctuation-dissipation theorem by means of taking up an athermal energy source from the environment. Currently, a variety of active particles and their transport patterns have been quantified based on novel experimental tools such as single-particle tracking. However, the comprehensive theoretical understanding for these processes remains challenging. Effectively the stochastic dynamics of these active particles can be modeled as a Langevin dynamics driven by a particular class of active noise. In this work, we investigate the corresponding Langevin dynamics under a telegraphic active noise. By both analytical and computational approaches, we study in detail the transport and nonequilibrium properties of this process in terms of physical observables such as the velocity autocorrelation, heat current, and the mean squared displacement. It is shown that depending on the properties of the amplitude and duration time of the telegraphic noise various transport patterns emerge. Comparison with other active dynamics models such as the run-and-tumble and Levy walks is also presented.

Keywords: active bath, anomalous diffusion, Langevin dynamics, Telegraphic noise, Levy walks, run-and-tumble

Received: 16 Jun 2019; Accepted: 13 Sep 2019.

Copyright: © 2019 Um, Song and Jeon. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Prof. Jae-Hyung Jeon, Department of Physics, Pohang University of Science and Technology, Pohang, 37673, North Gyeongsang, South Korea, jeonjh@gmail.com