Theoretical Physics - From Outer Space to Plasma

Nonlinear dynamics of active particles

11 snips
May 7, 2025
Dr. Rahil Valani, an expert in active matter, dives into the captivating world of nonlinear dynamics. He showcases how active particles, ranging from bacteria to robots, harness energy for movement. Valani particularly focuses on superwalking droplets, revealing their surprising hydrodynamic quantum analogs. The discussion also touches on the intricate behaviors of bouncing droplets on vibrating surfaces and their implications in the realm of non-equilibrium physics. Strap in for a journey through physics that’s as dynamic as the particles themselves!
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INSIGHT

What Are Active Particles?

  • Active particles consume environmental energy to produce directed, persistent motion, making them out-of-equilibrium entities.
  • They come in diverse forms from tiny molecular motors and cells to animals and robots, spanning nanometers to meters.
INSIGHT

Emergent Behaviors in Active Matter

  • Collections of active particles form active matter that exhibits unique non-equilibrium phases and emergent behaviors like flocking and active turbulence.
  • Motility-induced phase separation occurs even with only repulsive interactions due to particles slowing near each other, causing clustering.
INSIGHT

Conservative vs Dissipative Dynamics

  • Nonlinear dynamical systems model real-world dynamics through variables evolving over time, often governed by nonlinear equations.
  • These systems are classified as conservative (volume preserving) or dissipative (phase space volume shrinks), exhibiting distinct behaviors like Hamiltonian chaos or attractors.
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