Effective temperature of active fluids and sheared soft glassy materials

Saroj Kumar Nandi, N. S. Gov

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Article number117
Number of pages5
JournalEuropean Physical Journal E
Issue number10
StatePublished - Oct 2018

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Biophysics
  • Biotechnology
  • General Materials Science
  • Surfaces and Interfaces


Dive into the research topics of 'Effective temperature of active fluids and sheared soft glassy materials'. Together they form a unique fingerprint.

Cite this