Biological processes such as embryogenesis, wound healing and cancer progression rely
on the ability of epithelial cells to coordinate their mechanical activity over length scales that …

Convergent extension of epithelial tissue is a key motif of animal morphogenesis. On a
coarse scale, cell motion resembles laminar fluid flow; yet in contrast to a fluid, epithelial …

Abstract Changes in tissue geometry during developmental processes are associated with
collective migration of cells. Recent experimental and numerical results suggest that these …

We formulate a comprehensive hydrodynamic theory of two-dimensional liquid crystals with
generic p-fold rotational symmetry, also known as p-atics, of which nematics (p= 2) and …

Biological tissues transform between solid-and liquidlike states in many fundamental
physiological events. Recent experimental observations further suggest that in two …

Vortices are hallmarks of a wide range of nonequilibrium phenomena in fluids at multiple
length scales. In this work, we numerically study the whirling motion of self-propelled soft …

We coarse-grain a model of closely-packed ellipses that can vary their aspect ratio to derive
continuum equations for materials comprising confluent deformable particles such as …

Active emulsions and liquid crystalline shells are intriguing and experimentally realisable
types of topological matter. Here we numerically study the morphology and spatiotemporal …

We study a minimal model of a system with coexisting nematic and polar orientational
orders, where one field tends to order and the other prefers isotropy. For strong coupling, the …