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Area of Science:

  • Physics
  • Soft Matter Physics
  • Active Matter

Background:

  • Active particles are nonequilibrium systems converting energy into motion.
  • Walking/superwalking droplets are classical wave-particle entities (WPEs) exhibiting quantum system analogs.
  • Previous studies explored single WPEs; this work focuses on interacting WPE clusters.

Purpose of the Study:

  • To numerically investigate the dynamics of wave-particle entity (WPE) clusters.
  • To explore collective excitations and stability of interacting WPEs.
  • To identify hydrodynamic quantum analogs in active matter systems.

Main Methods:

  • Numerical simulation using a stroboscopic model.
  • Analysis of interacting WPE cluster dynamics.
  • Variation of wave spatial extent and temporal decay rate (memory).

Main Results:

  • Interacting WPEs self-organize into stable, nucleus-like bound clusters.
  • Clusters exhibit collective excitations: shape oscillations and chiral rotating modes.
  • Cluster disintegration or particle ejection (with exponential decay statistics) observed under specific conditions.

Conclusions:

  • Active particle clusters display rich dynamics, including collective excitations and decay patterns.
  • These dynamics show qualitative similarities to nuclear models (shell, bag models).
  • The study opens avenues for exploring hydrodynamic quantum analogs in active matter.