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Effervescence in a binary mixture with nonlinear non-reciprocal interactions.

Suropriya Saha1, Ramin Golestanian2,3

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Summary
This summary is machine-generated.

Nonlinear non-reciprocity in active species interactions can lead to spatiotemporal chaos. This phenomenon, termed effervescence, involves local parity and time-reversal (PT) symmetry restoration, creating oscillating densities and phase-separated droplets.

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Area of Science:

  • Physics
  • Chemical Dynamics
  • Complex Systems

Background:

  • Non-reciprocal interactions between scalar fields break parity and time-reversal (PT) symmetries.
  • This symmetry breaking often results in the emergence of traveling waves in equilibrium states.

Purpose of the Study:

  • To explore nonlinear non-reciprocity in active species interactions.
  • To investigate the emergence of spatiotemporal chaos and its underlying mechanisms.
  • To characterize a novel phenomenon termed 'effervescence'.

Main Methods:

  • Development of a model with locally sign-changing non-reciprocal interactions.
  • Analysis of the model's steady-state behavior.
  • Identification of conditions leading to spatiotemporal chaos and effervescence.

Main Results:

  • Generic cases with sign-changing non-reciprocity exhibit spatiotemporal chaos.
  • This chaos is linked to local PT symmetry restoration in fluctuating domains.
  • Observed coexistence of oscillating densities and spontaneously forming/annihilating phase-separated droplets.

Conclusions:

  • Effervescence represents a dynamical steady-state in extensive parameter spaces.
  • This phenomenon can manifest with or without an accompanying traveling wave.
  • Nonlinear non-reciprocity offers a route to complex emergent behaviors in active systems.