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Active particles create forces on objects, influenced by their activity gradients and particle sources/sinks. Particle flux can smooth density profiles and alter net forces, offering insights into biological systems.

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Area of Science:

  • Active Matter Physics
  • Soft Matter Physics
  • Biophysics

Background:

  • Active particles generate forces and motion, crucial in biological systems.
  • Gradients in particle activity and the presence of sources/sinks significantly impact system dynamics.
  • Understanding these forces is key to explaining phenomena like intracellular transport.

Purpose of the Study:

  • To investigate the force exerted by active particles on inert objects.
  • To analyze the effects of activity gradients and particle flux (sources/sinks) on force generation.
  • To provide a theoretical framework applicable to biological observations.

Main Methods:

  • Analytical solution of a one-dimensional active matter model.
  • Numerical simulations of a two-dimensional active matter model.
  • Modeling of particle creation and annihilation (sources and sinks).

Main Results:

  • Identified conditions under which particle flux smooths activity-induced density profiles.
  • Quantified the net force resulting from both activity gradients and particle flux.
  • The interplay between particle flux and activity gradients determines the resultant force.

Conclusions:

  • Particle flux can counteract or enhance forces from activity gradients.
  • The study provides a model for forces in systems with active particles and dynamic sources/sinks.
  • Results offer qualitative parallels to nuclear motion driven by active vesicles in oocytes.