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Home page > Séminaires > Archives séminaires > Séminaires 2016 > Séminaire MSC. 3 octobre 2016. Denis Bartolo (Ens Lyon) : "Flocking through disorder".

Séminaire MSC. 3 octobre 2016. Denis Bartolo (Ens Lyon) : "Flocking through disorder"

Sauf mention contraire, les séminaires et les soutenances se déroulent à 11h30 en salle 454A du bâtiment Condorcet.

Flocking through disorder

Denis Bartolo Laboratoire de Physique, ENS de Lyon, UMR CNRS 5672

How do flocks, herds and swarms proceed through disordered environments ? This question is not only crucial to animal groups in the wild, but also to virtually all applications of collective robotics, and active materials composed of synthetic motile units. In stark contrast, appart from very rare exceptions, our physical understanding of flocking has been hitherto limited to homogeneous media. In this talk, I will explain how collective motion survives to geometrical disorder building on model experiments on colloidal bots and analytical theory. I will explain : (i) how disorder and bending elasticity compete to channel the flow of polar flocks along sparse river networks and (ii) how, increasing disorder, collective motion is suppressed in the form of a first-order phase transition generic to all polar active materials.

Contact : Équipe séminaires / Seminar team - Published on / Publié le 12 juillet 2016

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