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Inertial active harmonic particle with memory induced spreading by viscoelastic suspension.

F Adersh1, M Muhsin1, M Sahoo2

  • 1Department of Physics, University of Kerala, Kariavattom, Thiruvananthapuram, 695581, India.

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Active particles in viscoelastic fluids exhibit distinct behaviors based on memory timescale. Increased memory enhances particle energy and movement, while longer activity duration leads to confinement.

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Area of Science:

  • Soft Matter Physics
  • Statistical Mechanics
  • Rheology

Background:

  • Active particles exhibit self-propulsion, crucial for understanding biological systems and synthetic materials.
  • Viscoelastic suspensions possess complex memory effects influencing particle dynamics.
  • Confining particles in harmonic traps simplifies analysis while retaining essential physics.

Purpose of the Study:

  • To investigate the self-propulsion dynamics of an inertial active particle within a 2D harmonic trap.
  • To analyze the influence of a viscoelastic medium with exponential friction kernel on particle motion.
  • To identify distinct behavioral regimes and their dependence on memory timescale and activity duration.

Main Methods:

  • Solving non-Markovian dynamics equations for particle motion.
  • Simulating particle trajectories in the viscoelastic medium.
  • Calculating steady-state probability distribution functions and mean square displacement.

Main Results:

  • Two distinct regimes of particle motion (oscillatory and non-oscillatory) were identified.
  • Increasing memory timescale enhances effective temperature, leading to increased particle energy and exploration of the trap.
  • Extended activity duration results in particle trapping within the harmonic potential.

Conclusions:

  • The interplay between memory effects in viscoelastic media and active particle dynamics is complex.
  • Memory timescale acts as a control parameter for particle energy and spatial exploration.
  • Harmonic confinement and activity duration dictate the long-term behavior and localization of active particles.