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SUMMARY:When active matter turns solid : from collective motion to collect
 ive actuation - Olivier Dauchot\, ESPCI Paris
DTSTART:20221129T130000Z
DTEND:20221129T140000Z
UID:TALK178562@talks.cam.ac.uk
CONTACT:Camille Scalliet
DESCRIPTION:Active matter is made of a large number of out of equilibrium 
 interacting units\, which convert some source of energy into directed moti
 on. In contrast with systems driven out of equilibrium by an external fiel
 d\, or through the boundaries\, the departure from equilibrium is local an
 d independent for each active unit. Not so surprisingly\, active matter ex
 hibits rich collective phenomena at large scales\, such as new types of ph
 ase separation and/or collective directed motion.  The past 25 years have 
 seen a surge of experimental observations and theoretical progress in the 
 description of such phenomena in the realm of active liquids.\nThere are h
 owever a number of circumstances under which the description in terms of l
 iquids is not suited. One can think of ants building solid bridges out of 
 their bodies\, meta-materials made of mechanically connected engines\, coh
 esive cell layers or simply very dense assemblies of self propelled partic
 les forming a glass or a crystal. In such cases a description in terms of 
 elastic solid is likely to be more appropriate. However very little is kno
 wn about the actuation of an elastic lattice by polar active particles\, t
 he orientations of which may couple to the displacement field. \n\nIn this
  talk\, I will present very recent experimental and theoretical works aimi
 ng at developing this new path of research in active matter. Doing so\, we
  shall unveil a new type of collective phenomena\, namely collective actua
 tion\, and discover how the coupling between linear elasticity and activit
 y leads to a rich selection mechanism of the actuated dynamics.\n
LOCATION:Center for Mathematical Sciences\, Lecture room MR4
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