Thermal fluctuations constantly excite all relaxation modes in an equilibrium crystal. As the
temperature rises, these fluctuations promote the formation of defects and eventually …

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 …

We demonstrate that two-dimensional crystals made of active particles can experience
extremely large spontaneous deformations without melting. Using particles mostly …

Morphogenesis, the process through which genes generate form, establishes tissue-scale
order as a template for constructing the complex shapes of the body plan. The extensive …

Biological cells can actively tune their intracellular architecture according to their overall
shape. Here we explore the rheological implication of such coupling in a minimal model of a …

We study the collective vibrational excitations of crystals under out-of-equilibrium steady
conditions that give rise to entropy production. Their excitation spectrum comprises …

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

We derive a fully covariant theory of the hydrodynamics of nematic and polar active surfaces,
subjected to internal and external forces and torques. We study the symmetries of polar and …

Spatiotemporal patterns in multicellular systems are important to understanding tissue
dynamics, for instance, during embryonic development and disease. Here, we use a …

The vibrational dynamics of solids is described by phonons constituting basic collective
excitations in equilibrium crystals. Here, we consider a non-equilibrium active solid, formed …