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SUMMARY:Emergent mesoscale correlations in active solids - Silke Henkes (U
 niversiteit Leiden)
DTSTART:20240613T092000Z
DTEND:20240613T101000Z
UID:TALK214717@talks.cam.ac.uk
DESCRIPTION:In soft active matter\, such as crawling and swimming cells\, 
 or active colloids and polymers\, active driving interacts with the mechan
 ical properties of the material to form active solids\, liquids and everyt
 hing in between.Here I will present how a generic mesoscopic correlation l
 ength emerges from the coupling of uncorrelated but persistent self-propul
 sion to the elasticity of the underlying material in overdamped dynamics. 
 It can be applied it to an intriguing system of travelling strings made of
  active colloids\, where it explains string propulsion and emergent tangen
 t-tangent corrleations seen in simulation and experiment.Within this frame
 work\, we can model epithelial cell sheets with active Brownian dynamics a
 nd soft repulsive interactions\, and also as a self-propelled Voronoi mode
 l. Then uncoordinated cell crawling interacting with mechanics produces ch
 aracteristic &rsquo\;swirly&rsquo\; motion with strong spatiotemporal corr
 elations. We are able to quantitatively match simulations and in-vitro cel
 l sheets made of corneal epithelial cells and MDCK cells. We can also show
  that these emergent correlations are a good model for the fingering insta
 bility at the edge of these sheets. I will conclude with recent results th
 at consider uncorrelated activity that takes the form of internal&nbsp\;st
 resses in the system\, which are a frequent feature in morphogenesis.
LOCATION:Seminar Room 1\, Newton Institute
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