标题： 悬浮中的非互易混合物：水动力相互作用的作用 显示英文标题

标题： Non-reciprocal mixtures in suspension: the role of hydrodynamic interactions

摘要： 非互惠耦合密度的集体追逐动力学导致了稳定的行进波，这些波可以映射到一种关于涌现群体运动的模型。 在本工作中，我们将非互惠Cahn-Hilliard模型（NRCH）与流体耦合，以最小描述悬浮液中的标量活性混合物，旨在探索波的稳定性，即在自生成流体流动存在下的涌现群体运动。 我们表明，对于主动应力的特定符号，涌现的极性对扰动线性不稳定，这回顾了流体中取向秩序的不稳定性。 然而，通过数值模拟，我们发现非互惠性在相空间的较大区域内稳定了波，以对抗线性不稳定性。 显示英文摘要

摘要： The collective chasing dynamics of non-reciprocally coupled densities leads to stable travelling waves which can be mapped to a model for emergent flocking. In this work, we couple the non-reciprocal Cahn-Hilliard model (NRCH) to a fluid to minimally describe scalar active mixtures in a suspension, with the aim to explore the stability of the waves, i.e. the emergent flock in the presence of self-generated fluid flows. We show that the emergent polarity is linearly unstable to perturbations for a specific sign of the active stress recalling instabilities of orientational order in a fluid. Using numerical simulations, we find however that non-reciprocity stabilizes the waves against the linear instability in a large region of the phase space.