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SUMMARY:Extensile-Contractile Phase Separation in Dry and Wet Active Nemat
 ic Vertex Models - Jan Rozman (University of Oxford)
DTSTART:20240614T135000Z
DTEND:20240614T142000Z
UID:TALK214774@talks.cam.ac.uk
DESCRIPTION:Authors: Jan Rozman and Julia M. Yeomans\nWe study a mixture o
 f extensile and contractile cells using a vertex model extended to include
  active nematic stresses [1]. The two cell populations phase separate over
  time. While an increase in contractile activity always aids phase separat
 ion\, sufficiently high extensile activity reduces the extent of sorting. 
 This can be understood by analysing a small contractile droplet in an exte
 nsile bulk: Increasing extensile activity results in the droplet being tor
 n apart by the activity of the bulk\, whereas greater contractile activity
  leads to cells &ldquo\;sticking&rdquo\; together\, maintaining a connecte
 d droplet for longer.\nWe compare these results with a "wet" vertex model 
 in which substrate-vertex friction is replaced by vertex-vertex friction [
 2] as a proxy for internal dissipation. This significantly changes the dyn
 amics of the vertex model\, allowing\, e.g.\, long range velocity correlat
 ions and unidirectional flows in a channel due to nematic activity [3].\nR
 eferences\n\nS.-Z. Lin\, M. Merkel\, and J.-F. Rupprecht\, Phys. Rev. Lett
 . 130\, 058202 (2023).\nS. Tong\, R. Sknepnek\, and A. Ko&scaron\;mrlj\, P
 hys. Rev. Research 5\, 013143 (2023).\nJ. Rozman\, Chaithanya K. V. S.\, J
 . M. Yeomans\, and R. Sknepnek\, arXiv:2312.11756 (2023).\n
LOCATION:Seminar Room 1\, Newton Institute
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