Abstract.
In computer simulations of dry foams and of epithelial tissues, vertex models are often used to describe the shape and motion of individual cells. Although these models have been widely adopted, relatively little is known about their basic theoretical properties. For example, while fourfold vertices in real foams are always unstable, it remains unclear whether a simplified vertex model description has the same behavior. Here, we study vertex stability and the dynamics of T1 topological transitions in vertex models. We show that, when all edges have the same tension, stationary fourfold vertices in these models do indeed always break up. In contrast, when tensions are allowed to depend on edge orientation, fourfold vertices can become stable, as is observed in some biological systems. More generally, our formulation of vertex stability leads to an improved treatment of T1 transitions in simulations and paves the way for studies of more biologically realistic models that couple topological transitions to the dynamics of regulatory proteins.
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Spencer, M.A., Jabeen, Z. & Lubensky, D.K. Vertex stability and topological transitions in vertex models of foams and epithelia. Eur. Phys. J. E 40, 2 (2017). https://doi.org/10.1140/epje/i2017-11489-4
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DOI: https://doi.org/10.1140/epje/i2017-11489-4