Breakdown of effective temperature, power law interactions and self-propulsion in a momentum conserving active fluid

偶极矩守恒主动流体中流体力学的破裂与恢复

Breakdown and Restoration of Hydrodynamics in Dipole-conserving Active Fluids

该研究揭示了偶极矩守恒的主动流体在不同维度下流体力学行为的转变，发现活动性可恢复或破坏线性流体力学，拓展了流体动力学的普遍性类别。

活性Janus胶体多物种悬浮液中的流体动力学应力

Hydrodynamic stresses in a multi-species suspension of active Janus colloids

本研究通过系统粗粒化微观动力学，计算活性Janus胶体多物种悬浮液的流体动力学应力张量多组分贡献，揭示单物种系统应力强度的调控机制及多物种系统中活性对张量的修饰与非互易性的产生。

Hidden entropy production and work fluctuations in an ideal active gas

Collections of self-propelled particles that move persistently by continuously consuming free energy are a paradigmatic example of active matter. In these systems, unlike Brownian "hot colloids", the breakdown of detailed balance yields a continuous production of entropy at steady state, even for an ideal active gas. We quantify the irreversibility for a non-interacting active particle in two dimensions by treating both conjugated and time-reversed dynamics. By starting with underdamped dynamics, we identify a hidden rate of entropy production required to maintain persistence and prevent the r…

Do active nematic self-mixing dynamics help growing bacterial colonies to maintain local genetic diversity?

Recent studies have shown that packings of cells, both eukaryotic cellular tissues and growing or swarming bacterial colonies, can often be understood as active nematic fluids. A key property of volume-conserving active nematic model systems is chaotic self-mixing characterized by motile topological defects. However, for active nematics driven by growth rather than motility, less is understood about mixing and defect motion. Mixing could affect evolutionary outcomes in bacterial colonies by counteracting the tendency to spatially segregate into monoclonal sectors, which reduces the local genet…

存在平动和转动惯性的活性布朗粒子系统中的维里应力

Virial stress in systems of active Brownian particles in the presence of translational and rotational inertia

通过拉格朗日方程推导了含平动和转动惯性的活性布朗粒子系统的应力张量，发现周期系统状态方程依赖于惯性，而壁面约束导致极化增强和状态方程失效，但体相局部应力与周期系统一致，且泳动应力不包含在局部应力张量中。

非互易群体感应活性物质中的相共存

Phase Coexistence in Nonreciprocal Quorum-Sensing Active Matter

本文研究非互易群体感应活性粒子的相行为，在弱非互易下建立相共存解析判据，在强非互易下揭示相行为依赖观测尺度且大尺度集体运动消失。