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Updated: May 24, 2026

Controlling Flow Speeds of Microtubule-Based 3D Active Fluids Using Temperature
08:04

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Published on: November 26, 2019

Cooling Mechanism Controls Motility-Induced Phase Separation in Inertial Active Liquids.

Manuel Mayo1, Lorenzo Caprini2, María Isabel García de Soria1

  • 1Universidad de Sevilla, Física Teórica, Apartado de Correos 1065, E-41080 Sevilla, Spain.

Physical Review Letters
|May 22, 2026
PubMed
Summary
This summary is machine-generated.

Inertia fundamentally alters motility-induced phase separation (MIPS) in active matter by introducing a novel cooling mechanism. This inertial MIPS can occur without particle impenetrability, linking active matter to granular physics.

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Area of Science:

  • Physics
  • Active Matter Physics
  • Statistical Mechanics

Background:

  • Motility-induced phase separation (MIPS) is a key collective behavior in active matter.
  • Existing theories primarily focus on the overdamped regime, neglecting inertial effects.

Purpose of the Study:

  • To investigate the role of inertia in MIPS.
  • To uncover the underlying dynamical mechanisms of inertial MIPS.
  • To connect inertial active matter with granular physics.

Main Methods:

  • Developed an active variant of the direct simulation Monte Carlo (DSMC) method.
  • Formulated a kinetic theory for inertial self-propelled hard spheres.

Main Results:

  • Inertia induces a cooling mechanism absent in overdamped active matter.
  • Inertial MIPS can occur even without particle impenetrability.
  • A density-dependent cooling mechanism arises from the interplay of density, orientation, and temperature.

Conclusions:

  • Inertia fundamentally changes the dynamics of MIPS.
  • The discovered mechanism links inertial active matter to granular physics.
  • This work provides new insights into collective phenomena in non-equilibrium systems.