论文标题
列明拓扑缺陷的波动引起的动力学
Fluctuation-induced dynamics of nematic topological defects
论文作者
论文摘要
在各种生物系统中，拓扑缺陷越来越多地被鉴定出来，在各种生物系统中，它们的特征流场和应力模式与生物实体的连续主动应力产生相关。在这里，使用连续波动的线虫水力动力学的数值模拟，我们表明，即使没有任何与自我渗透相关的特定形式的活性应力形式，在定向对准或流体动力学中的介质波动也可以独立地导致在有效系统中观察到的拓扑缺陷的流动模式。我们的模拟进一步表明了波动引起的半刻孔拓扑缺陷的延伸和收缩样运动的可能性。值得注意的是，各向同性应力场还重现了上皮拓扑缺陷周围的实验测量应力模式。我们的发现进一步表明，周围波动引起的缺陷周围的延伸或收缩的流动和应力模式受孕妇的被动弹性应力和流动对准行为的控制。
Topological defects are increasingly being identified in various biological systems, where their characteristic flow fields and stress patterns are associated with continuous active stress generation by biological entities. Here, using numerical simulations of continuum fluctuating nematohydrodynamics we show that even in the absence of any specific form of active stresses associated with self-propulsion, mesoscopic fluctuations in either orientational alignment or hydrodynamics can independently result in flow patterns around topological defects that resemble the ones observed in active systems. Our simulations further show the possibility of extensile- and contractile-like motion of fluctuation-induced positive half-integer topological defects. Remarkably, isotropic stress fields also reproduce the experimentally measured stress patterns around topological defects in epithelia. Our findings further reveal that extensile- or contractile-like flow and stress patterns around fluctuation-induced defects are governed by passive elastic stresses and flow-aligning behavior of the nematics.
