双相活性物质的微分活性驱动不稳定性
Differential-activity driven instabilities in biphasic active matter
摘要：
主动应力可导致收缩凝胶和活组织的不稳定性。在这里，我们描述了一个通用的流体力学理论，把这些系统作为一个混合物的两个阶段的不同活动和不同的机械性能。我们发现，相之间的差分活动提供了一种机制，造成分层不稳定。我们遵循的非线性演化的不稳定性和特征所产生的图案的相图。我们的研究补充了混合物中的其他不稳定机制，如差异生长，形状，运动或粘附。
英文摘要：
Active stresses can cause instabilities in contractile gels and living tissues. Here we describe 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 provides a mechanism causing 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 such as differential growth, shape, motion or adhesion.
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