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SUMMARY:Three-Dimensional Active Defect Loops - Gareth Alexander\, Warwick
DTSTART:20200505T120000Z
DTEND:20200505T130000Z
UID:TALK140407@talks.cam.ac.uk
CONTACT:Professor Mike Cates
DESCRIPTION:We describe the flows and morphological dynamics of topologica
 l defect lines and loops in three-dimensional active nematics and show\, u
 sing theory and numerical modelling\, that they are governed by the local 
 profile of the orientational order surrounding the defects. Analysing a co
 ntinuous span of defect loop profiles\, ranging from radial and tangential
  twist to wedge ±1/2 profiles\, we show that the distinct geometries can 
 drive material flow perpendicular or along the local defect loop segment\,
  whose variation around a closed loop can lead to net loop motion\, elonga
 tion\, or compression of shape\, or buckling of the loops. We demonstrate 
 a correlation between local curvature and the local orientational profile 
 of the defect loop\, indicating dynamic coupling between geometry and topo
 logy. To address the general formation of defect loops in three dimensions
 \, we show their creation via bend instability from different initial elas
 tic distortions.
LOCATION:Zoom: https://zoom.us/j/5916271322 Meeting ID: 591-627-1322
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