 Ordered motion of active colloids and effective temperatureS.L. Sobolev and I.V. Kudinov Physica A: Statistical Mechanics and its Applications, 2020, vol. 540, issue C Abstract: Using recent developments of non-equilibrium thermodynamics, we introduce an effective temperature for active colloidal systems, which is a product of two factors. The first one arises due to the motor activity and describes the randomized motion of the active particles, whereas the second one is a consequence of the ordered (collective) motion due to the alignment effects or initially ordered configuration. These factors depend on the corresponding characteristic velocities: the first one is expressed in terms of the propelled (swimming) velocity of an individual active particle, while the second one — in terms of the local drift velocity, which characterizes the collective motion of the active particles and plays a role analogous to that of an order parameter. The behavior of the active systems is governed by the interplay between these two factors, which leads to a hierarchy of anomalous diffusion regimes with different characteristic time scales and corresponding effective diffusion coefficients. Keywords: Active systems; Nonequilibrium; Effective temperature; Anomalous diffusion; Soft matter (search for similar items in EconPapers) Downloads: (external link) Related works: Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:540:y:2020:i:c:s0378437119317777 DOI: 10.1016/j.physa.2019.123155 Access Statistics for this article Physica A: Statistical Mechanics and its Applications is currently edited by K. A. Dawson, J. O. Indekeu, H.E. Stanley and C. Tsallis More articles in Physica A: Statistical Mechanics and its Applications from Elsevier |
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