Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session F20: Active Matter and Liquid Crystals in Biological and Bio-Inspired Systems I
8:00 AM–11:00 AM,
Tuesday, March 15, 2022
Room: McCormick Place W-185BC
Sponsoring Units: DSOFT DPOLY GSNP
Chair: Mehdi Molaei, U Chicago
Abstract: F20.00015 : Deformation Dynamics of Active Shells: Polar v Nematic*
10:48 AM–11:00 AM
Ludwig A Hoffmann
Ludwig A Hoffmann
Livio N Carenza
However, so far geometry has mostly been considered as a fixed background rather than coupled to the dynamics. We lift this constraint and consider, analytically and with simulations, active liquid crystals coupled to an elastic, initially spherical, surface. Due to topological constrains there are always defects present. Building on our model of defect-driven active buckling [arXiv:2105.15200] we show that in the polar system with extensile activity the sphere flattens, eventually leading to a genus transformation from a sphere to a torus in the turbulent regime. For the nematic case we observe periodic deformations of the shell and the formation of protrusions. This work thus clarifies the interaction of active defects and geometry and provides potentially new insight into morphogenesis.
*Supported by the Netherlands Organization for Scientific Research (NWO/OCW) as part of the Vidi scheme, and by the European Union via the ERC-CoGgrant HexaTissue.
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