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Controlling Flow Speeds of Microtubule-Based 3D Active Fluids Using Temperature
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Published on: November 26, 2019

Effective temperature of active matter.

Davide Loi1, Stefano Mossa, Leticia F Cugliandolo

  • 1European Synchrotron Radiation Facility, Boîte Postale 220, F-38043 Grenoble, France.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|July 23, 2008
PubMed
Summary
This summary is machine-generated.

Self-propelled particles in a thermal bath exhibit an effective temperature higher than the bath temperature. This effective temperature is controllable via motor intensity and consistent with fluctuation-dissipation relations.

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Area of Science:

  • Statistical mechanics
  • Soft matter physics
  • Non-equilibrium systems

Background:

  • Understanding the thermodynamics of active matter is crucial.
  • Self-propelled particles interact with their environment and exhibit complex dynamics.
  • Equilibrated thermal baths provide a standard reference for temperature.

Purpose of the Study:

  • To investigate the dynamics of interacting self-propelled particles in a thermal bath.
  • To define and validate an effective temperature for such systems.
  • To explore the relationship between motor intensity and effective temperature.

Main Methods:

  • Simulating an ensemble of interacting self-propelled motorized particles.
  • Analyzing particle dynamics in contact with an equilibrated thermal bath.
  • Applying fluctuation-dissipation relations and tracer particle thermometry.

Main Results:

  • An effective temperature can be defined using fluctuation-dissipation relations.
  • This effective temperature is higher than the bath temperature.
  • The effective temperature is directly controlled by the motor intensity of the particles.

Conclusions:

  • The fluctuation-dissipation relation provides a valid method for defining effective temperature in active matter systems.
  • Motor intensity is a key parameter in controlling the effective temperature of self-propelled particles.
  • These findings contribute to the understanding of non-equilibrium thermodynamics in active systems.