论文标题
层状到胶束阶段及以后：当战术活动系统接收自由能功能时
Lamellar to micellar phases and beyond: when tactic active systems admit free-energy functionals
论文作者
论文摘要
我们考虑的显微镜模型的活性颗粒模型的速度，旋转扩散率和翻滚速率取决于局部场的梯度，该局部场是外部施加的，或取决于所有粒子位置。尽管在微观范围内主动和被动动力学之间存在根本差异，但我们表明，一系列这样的战术活动系统接种了与平衡相互作用的水动力学波动的波动。我们利用此映射来显示出出租车如何导致对软排斥胶体观察到的层状和胶束相。在趋化性的背景下，我们展示了化学吸引剂与化学物质之间的竞争如何导致真正的平衡液态气相分离，在这种平衡中，流体信号的热力学稳定性丧失了趋化性崩溃的发作。
We consider microscopic models of active particles whose velocities, rotational diffusivities, and tumbling rates depend on the gradient of a local field, which is either externally imposed or depends on all particle positions. Despite the fundamental differences between active and passive dynamics at the microscopic scale, we show that a large class of such tactic active systems admit fluctuating hydrodynamics equivalent to those of interacting Brownian colloids in equilibrium. We exploit this mapping to show how taxis may lead to the lamellar and micellar phases observed for soft repulsive colloids. In the context of chemotaxis, we show how the competition between chemoattractant and chemorepellent may lead to a bona-fide equilibrium liquid-gas phase separation in which a loss of thermodynamic stability of the fluid signals the onset of a chemotactic collapse.
