Differential Activity-Driven Instabilities in Biphasic Active Matter.
- Author(s): Weber, Christoph A
- Rycroft, Chris H
- Mahadevan, L
- et al.
Published Web Locationhttps://doi.org/10.1103/physrevlett.120.248003
Active stresses can cause instabilities in contractile gels and living tissues. Here we provide a generic hydrodynamic theory that treats these systems as a mixture of two phases of varying activity and different mechanical properties. We find that differential activity between the phases causes a uniform mixture to undergo a demixing instability. We follow the nonlinear evolution of the instability and characterize a phase diagram of the resulting patterns. Our study complements other instability mechanisms in mixtures driven by differential adhesion, differential diffusion, differential growth, and differential motion.