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This study modifies the active Brownian particle (ABP) model by introducing nonthermal noise, revealing coupled diffusion and noise-induced drift effects that impact particle movement and long-time diffusivity.

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Area of Science:

  • Physics
  • Soft Matter Physics
  • Statistical Mechanics

Background:

  • The active Brownian particle (ABP) model traditionally describes self-propelled objects with thermally driven fluctuations.
  • Existing models often assume isotropic diffusion and neglect nonthermal noise sources.

Purpose of the Study:

  • To develop a two-dimensional model of active Brownian particles with nonthermal noise in the propulsion force.
  • To investigate modifications to the standard ABP model under these new conditions.

Main Methods:

  • Formulating a two-dimensional model with nonthermal noise acting at a single propulsion point.
  • Analyzing the system in the overdamped limit.
  • Deriving the diffusion tensor and examining noise-induced drift.

Main Results:

  • The model exhibits a coupled diffusion tensor between translational and rotational motion due to fluctuating torque.
  • Anisotropic particles show mass-dependent noise-induced drift, persisting even in the overdamped limit.
  • These effects contribute to long-time diffusivity independently of the force's application point.

Conclusions:

  • Nonthermal noise significantly alters the dynamics of active Brownian particles compared to traditional models.
  • Coupled diffusion and persistent drift are key consequences of this noise.
  • The findings have implications for understanding synthetic and biological swimmers with flagellar propulsion.