Theory of defect motion in 2D passive and active nematic liquid crystals

摘要: The motion of topological defects is an important feature the dynamics all liquid crystals, and especially conspicuous in active crystals. Understanding defect a challenging theoretical problem, because orientational order coupled with backflow fluid, crystal has several distinct viscosity coefficients. Here, we suggest coarse-grained, variational approach, which describes as effective `particles.' For passive theory shows how drag depends on orientation, coupling between translational rotational motion. provides alternative way to describe induced by activity coefficient.