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MPIDS Colloquium

MPIDS Colloquium: Flocks and crowds: a Gulliver travel

  • Datum: 17.04.2019
  • Uhrzeit: 14:15 - 15:15
  • Vortragender: Prof. Denis Bartolo
  • Laboratoire de Physique, ENS de Lyon, France
  • Ort: Max-Planck-Institut für Dynamik und Selbstorganisation (MPIDS)
  • Raum: Prandtl Lecture Hall
  • Gastgeber: MPIDS
  • Kontakt: corinna.maass@ds.mpg.de
In the first part of my talk, building on spontaneously flowing liquids assembled form colloidal rollers, I will show that (french) active colloids collectively protest and resist when one tries to waive their privilege to freely choose their direction of motion: I will demonstrate that the flows emerging from flocking transitions are intrinsically bistable and can proceed against external pressure gradients. I will theoretically explain this collective stubbornness showing that orientational elasticity and confinement conspire to protect the direction of spontaneous active flows. In the sedan part of my talk, I will show how to construct a hydrodynamic description of another class of active material assembled from constituant 6 order of magnitude larger that active colloids: pedestrian crowds. I will show how to infer crowd hydrodynamics from their spontaneous fluctuations response to external perturbations.
 
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