Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session Y20: Active Matter and Liquid Crystals in Biological and Bio-Inspired Systems IV
8:00 AM–10:36 AM,
Friday, March 18, 2022
Room: McCormick Place W-185BC
Sponsoring
Units:
DSOFT DPOLY GSNP
Chair: Antonio Tavera-Vázquez, Chicago
Abstract: Y20.00004 : Dilute suspensions of motile microorganisms are not active liquid crystals*
8:36 AM–8:48 AM
Presenter:
Viktor Skultety
(University of Edinburgh)
Authors:
Viktor Skultety
(University of Edinburgh)
Cesare Nardini
(CEA Paris-Saclay)
Joakim Stenhammer
(Lund University)
Davide Marenduzzo
(University of Edinburgh)
Alexander Morozov
(University of Edinburgh)
In this work, we address the question whether dilute suspensions of motile microorganisms can be adequately described by AGT. Starting from a kinetic theory that is known to correctly incorporate long-range hydrodynamic interactions that play a crucial role in the collective behaviour of such systems, we perform a systematic reduction of their equation of motion. Although the resulting continuum PDE's appear to be similar to AGT formulated for an isotropic active liquid crystal, no mapping between them exists even at the mean-field level. While AGT has an intrinsic active lengthscale, our continuum theory is scale-free, with the pattern size being selected by the size of the system. We further discuss the relationship between the two theories in two dimensions, and confirm our findings through direct numerical simulations.
*EPSRC via CM-CDT
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