Past Event

INET Post-doc/Researcher Talks: Charles Savoie "Emergent vortices in populations of colloidal rollers"

"Emergent vortices in populations of colloidal rollers"
 
Coherent vortical motion has been reported in a wide variety of populations including living organisms (bacteria, fishes, human crowds) and synthetic active matter (shaken grains, mixtures of biopolymers), yet a unified description of the formation and structure of this pattern remains lacking. We report the self-organization of motile colloids into a macroscopic steadily rotating vortex. Combining physical experiments and numerical simulations, we elucidate this collective behavior. We demonstrate that the emergent-vortex structure lives on the verge of a phase separation, and single out the very ingredient responsible for this state of polar active matter. Building on this observation, we establish a continuum theory and lay out a strong foundation for the description of vortical collective motion in a broad class of motile populations constrained by geometrical boundaries. 
 

Tea & cake available from 3pm, talk starts at 3.15pm for 30 minutes to then be followed by discussion.

Details:

12 February 2015 15:00 -


Location

INET Oxford

Eagle House, Walton Well Road, Oxford, OX2 6ED


Complexity Economics