Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session P48: Motion and Jamming of Cells
2:30 PM–5:18 PM,
Wednesday, March 7, 2018
LACC Room: 510
Sponsoring Units: GSNP GSOFT DBIO
Chair: Mark Shattuck, City College of New York CUNY
Abstract: P48.00008 : Anomalous glassy dynamics in simple models of biological tissue*
4:42 PM–4:54 PM
understanding the interplay between rigidity and motility in biological tissues. Here we present a detailed study of the role of fluctuations on the disordered rigidity transition of a Voronoi model that describes a confluent tissue monolayer as a network of polygons determined by a Voronoi tessellation of the cell positions. We show that just as in particulate glasses, the dynamics slow as the system approaches the glass transition. However, in contrast to the super-Arrhenius behavior associated with growing energy barriers seen in particulate glasses, the Voronoi model displays sub-Arrhenius behavior. Moreover, the low-frequency spectrum indicates that the potential energy landscape becomes flatter at lower temperatures, with little evidence for quasi-localized excitations, which
is also in marked contrast to structural glasses. This suggests that glassy behavior in Voronoi models, and perhaps biological tissues, is distinct from that in many glasses, and may provide unique insight into the glass transition itself.
*Simons Foundation grants 342354 (MCM, MP), 446222 (MLM) and 454947 (MLM) and the National Science Foundation DMR-1609208 (MCM), NSF-PHY-1607416 (DMS, MCM, MLM).
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