Constitutive equations for a one-dimensional, active, polar, viscoelastic liquid are derived by treating the strain field as a slow hydrodynamic variable. Taking into account the couplings between strain and polarity allowed by symmetry, the hydrodynamics of an active, polar, viscoelastic body include an evolution equation for the polarity field that generalizes the damped Kuramoto-Sivashinsky equation. Beyond thresholds of the active coupling coefficients between the polarity and the stress or the strain rate, bifurcations of the homogeneous state lead first to stationary waves, then to propagating waves of the strain, stress and polarity fields. I argue that these results are relevant to living matter, and may explain rotating actomyosin rings in cells and mechanical waves in epithelial cell monolayers.
Is the active suspension in a complex viscoelastic fluid more chaotic or more ordered?
Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences（中国科学院上海微系统与信息技术研究所）；University of Chinese Academy of Sciences（中国科学院大学）；Universitat de Barcelona（巴塞罗那大学）
Externally driven condensates show translation-induced polarization, directed coalescence, and anomalous diffusion in viscoelastic media
Institute for Medical Engineering and Science, Massachusetts Institute of Technology（麻省理工学院医学工程与科学研究所）；Department of Systems Immunology, Helmholtz Centre for Infection Research（亥姆霍兹感染研究中心系统免疫学部）；Institute for Biochemistry, Biotechnology and Bioinformatics, Technische Universität Braunschweig（布伦瑞克工业大学生物化学、生物技术及生物信息学研究所）；Lower Saxony Center for Artificial Intelligence and Causal Methods in Medicine (CAIMed)（下萨克森州医学人工智能与因果方法中心（CAIMed））
Spatiotemporal Control of Charge +1 Topological Defects in Polar Active Matter
TU Dresden（德累斯顿工业大学）；University of Geneva（日内瓦大学）；Dresden University of Technology（德累斯顿工业大学）；Max Planck Institute of Molecular Cell Biology and Genetics（马克斯·普朗克分子细胞生物学与遗传学研究所）；Center for Systems Biology Dresden（德累斯顿系统生物学中心）；Max Planck Institute for the Physics of Complex Systems（马克斯·普朗克复杂系统物理研究所）；Cluster of Excellence “Physics of Life”, TU Dresden（德累斯顿工业大学“生命物理学”卓越集群）
OpTiDDM (Optical Tweezers integrating Differential Dynamic Microscopy) maps the spatiotemporal propagation of nonlinear stresses in polymer blends and composites
