Effective temperature of active fluids and sheared soft glassy materials

. 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...

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Bibliographic Details
Published in:The European physical journal. E, Soft matter and biological physics Soft matter and biological physics, 2018-10, Vol.41 (10), p.117-117, Article 117
Main Authors: Nandi, Saroj Kumar, Gov, N. S.
Format: Article
Language:English
Subjects:
Biological and Medical Physics
Biophysics
Complex Fluids and Microfluidics
Complex Systems
Condensed matter physics
Flowing Matter
Fluid dynamics
Kinetic energy
Mathematical analysis
Nanotechnology
Physics
Physics and Astronomy
Polymer Sciences
Problems and Applications
Regular Article
Shearing
Soft and Granular Matter
Surfaces and Interfaces
Thin Films
Tracer particles
Variation
Viscoelasticity
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Summary:. 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
ISSN:1292-8941
1292-895X
DOI:10.1140/epje/i2018-11731-7