论文标题
旋转惯性在积极物质中的集体现象的作用
Role of rotational inertia for collective phenomena in active matter
论文作者
论文摘要
我们研究了旋转惯性对失水不足的活动系统集体现象的影响，并表明每个粒子的惯性矩的增加有利于非平衡相共存（称为运动诱导的相位分离），并抵消了由于翻译惯性而引起的抑制作用。我们的结论得到了非平衡相图（在旋转惯性时间和翻译惯性时间跨越的平面中），其过渡线通过缩放参数从理论上理解。另外，旋转惯性增加了密集簇中空间速度相关性的相关长度。旋转惯性增强了集体现象的事实，例如运动诱导的相分离和空间速度相关性，与旋转持久性的增加密切相关。此外，在非平衡系统中，惯性的大矩会引起转化和旋转自由度之间的非单调时间（交叉）相关性。
We investigate the effect of rotational inertia on the collective phenomena of underdamped active systems and show that the increase of the moment of inertia of each particle favors non-equilibrium phase coexistence, known as motility induced phase separation, and counteracts its suppression due to translational inertia. Our conclusion is supported by a non-equilibrium phase diagram (in the plane spanned by rotational inertial time and translational inertial time) whose transition line is understood theoretically through scaling arguments. In addition, rotational inertia increases the correlation length of the spatial velocity correlations in the dense cluster. The fact that rotational inertia enhances collective phenomena, such as motility induced phase separation and spatial velocity correlations, is strongly linked to the increase of rotational persistence. Moreover, large moments of inertia induce non-monotonic temporal (cross) correlations between translational and rotational degrees of freedom truly absent in non-equilibrium systems.
