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Updated: Sep 4, 2025

Controlling Flow Speeds of Microtubule-Based 3D Active Fluids Using Temperature

Controlling Flow Speeds of Microtubule-Based 3D Active Fluids Using Temperature

Published on: November 26, 2019

Effective temperature and Einstein relation for particles in active matter flows.

Sanjay C P¹, Ashwin Joy¹

¹Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India.

Physical Review. E

|July 20, 2022

Summary

This study derives an effective temperature for particles in active matter flows, verifying the Einstein relation. The temperature depends linearly on particle diffusivity, influenced by fluid ordering.

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Area of Science:

Physics
Soft Matter Physics
Statistical Mechanics

Background:

Active matter systems exhibit complex phases like swarming and turbulence.
Understanding emergent properties in non-equilibrium systems is crucial.

Purpose of the Study:

To determine an effective temperature for particles advected in active matter flows.
To investigate the relationship between particle dynamics and the active fluid environment.

Main Methods:

Utilized a continuum model of a dense bacterial suspension.
Derived an exact expression for effective temperature.

Main Results:

Effective temperature is linear with particle diffusivity.
Particle mobility is higher in ordered polar fluids and lower in isotropic equilibrium fluids.
Direct verification of the Einstein relation in active matter flows.

Conclusions:

The Einstein relation holds for interacting particles in active matter.
The effective temperature provides insights into fluctuation-dissipation in non-equilibrium systems.