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

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Published on: November 26, 2019

Brownian motion with active fluctuations.

Pawel Romanczuk1, Lutz Schimansky-Geier

  • 1Institute of Physics, Humboldt University at Berlin, Berlin, Germany. prom@pks.mpg.de

Physical Review Letters
|July 21, 2011
PubMed
Summary
This summary is machine-generated.

Active fluctuations in self-propelled particle motion increase low-speed probability and create peaked velocity densities, unlike passive fluctuations. This study analyzes active Brownian particles and their stochastic forces.

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Area of Science:

  • Physics
  • Statistical Mechanics
  • Soft Matter Physics

Background:

  • Self-propelled particles exhibit complex dynamics influenced by various fluctuations.
  • Distinguishing between passive (e.g., thermal) and active fluctuations is crucial for understanding particle behavior.

Purpose of the Study:

  • To investigate the distinct effects of passive and active fluctuations on the motion of 2D self-propelled particles.
  • To derive analytical expressions for speed and velocity distributions under different fluctuation types.

Main Methods:

  • Derivation of analytical expressions for speed and velocity probability density functions.
  • Analysis of a generic model for active Brownian particles.
  • Comparison of dynamics under passive versus active fluctuations.

Main Results:

  • Active fluctuations lead to an increased probability of low speeds compared to passive fluctuations.
  • Sharply peaked Cartesian velocity probability densities at the origin are predicted for active fluctuations.
  • Similar behaviors are observed even with non-Gaussian active fluctuations.

Conclusions:

  • Active fluctuations significantly alter the motion of self-propelled particles, favoring lower speeds and distinct velocity profiles.
  • The findings have implications for understanding collective behavior and transport in active matter systems.
  • Further investigation into correlations of stochastic forces is warranted.