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Noise-induced collective actuation in active solids.

Paul Baconnier1,2, Vincent Démery2,3, Olivier Dauchot2

  • 1AMOLF, 1098 XG Amsterdam, The Netherlands.

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This study reveals that noise can induce collective actuation in active elastic solids. Experiments and modeling show noise drives synchronized oscillations along a specific system mode, leading to a Hopf bifurcation.

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Area of Science:

  • Soft Matter Physics
  • Nonlinear Dynamics
  • Active Matter

Background:

  • Collective actuation in active solids arises from elasto-active feedback.
  • Typically, this leads to synchronized oscillations on specific dynamic modes without noise.

Purpose of the Study:

  • To investigate the role of noise in collective actuation.
  • To understand how noise influences synchronized oscillations in active elastic structures.

Main Methods:

  • Experimental analysis of centimetric active elastic structures.
  • Numerical and theoretical analysis using an agent-based model.
  • Investigation of noise effects in a single-particle model and continuous limit.

Main Results:

  • Collective oscillation was observed along the system's lowest energy mode, distinct from others due to geometry.
  • The study demonstrates that this specific form of collective actuation is noise-induced.
  • Noise was shown to induce a supercritical Hopf bifurcation in the continuous limit.

Conclusions:

  • Noise plays a crucial role in initiating collective actuation in active elastic solids.
  • The system's geometry and noise interact to select a specific mode for synchronized oscillations.
  • This work redefines the transition to collective actuation as a noise-induced phenomenon.