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SUMMARY:Generic long-range interactions between bodies in an active fluid 
 - Yongjoo Baek (University of Cambridge)
DTSTART:20171123T130000Z
DTEND:20171123T140000Z
UID:TALK95371@talks.cam.ac.uk
CONTACT:Julius Bier Kirkegaard
DESCRIPTION:It is well known that active particles in a ratchet potential 
 generate macroscopic currents. Based on a canonical model of dry active ma
 tter\, we show that these currents produce generic long-range interactions
  between passive bodies immersed in an active fluid. Using multipole expan
 sions\, the anisotropy and power-law behaviours of the interactions are ch
 aracterised in the far-field limit. We also identify interesting pairwise 
 dynamics of passive bodies arising from the interactions\, illustrated by 
 the spontaneous rotation of non-chiral bodies and the formation of traveli
 ng bound pairs. The occurrence of these phenomena depends on tuneable prop
 erties of the bodies\, thus opening new possibilities for self-assembly me
 diated by active fluids.
LOCATION:MR11\, Centre for Mathematical Sciences\, Wilberforce Road\, Camb
 ridge
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