Effective temperature of active fluids and sheared soft glassy materials

  • Saroj Kumar Nandi
  • N. S. GovEmail author
Regular Article
Part of the following topical collections:
  1. Flowing Matter, Problems and Applications


The dynamics within active fluids, driven by internal activity of the self-propelled particles, is a subject of intense study in non-equilibrium physics. These systems have been explored using simulations, where the motion of a passive tracer particle is followed. Similar studies have been carried out for a soft glassy material that is driven by shearing its boundaries. In both types of systems the non-equilibrium motion have been quantified by defining a set of “effective temperatures”, using both the tracer particle kinetic energy and the fluctuation-dissipation relation. We demonstrate that these effective temperatures extracted from the many-body simulations fit analytical expressions that are obtained for a single active particle inside a visco-elastic fluid. This result provides testable predictions and suggests a unified description for the dynamics inside active systems.

Graphical abstract


Topical issue: Flowing Matter, Problems and Applications 


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Copyright information

© EDP Sciences, SIF, Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Chemical and Biological PhysicsThe Weizmann Institute of ScienceRehovotIsrael

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