论文标题
全息超流体中涡流偶极子的动力学
Dynamics of a Vortex Dipole in a Holographic Superfluid
论文作者
论文摘要
我们使用全息图研究在2+1维中强耦合的超氟中涡旋 - 抗涡旋偶极子的动力学。该系统在数值实时模拟中进行评估，以研究涡流接近并最终彼此消灭的涡流的演变。引入了具有子平面分辨率的跟踪算法，该算法允许对涡流轨迹进行高精度的确定。随着轨迹的提高精度，有可能直接计算涡旋速度和加速度。我们发现，在全息超流体中，涡旋遵循通用轨迹，与它们的初始分离无关，表明涡流 - 抗涡流对完全以其分离为单位。由于涡流的数值初始化，在进化早期涡流运动中的微妙非宇宙效应可以完全归因于伪像。我们还研究了动力学对超流体温度的依赖性。
We use holography to investigate the dynamics of a vortex-anti-vortex dipole in a strongly coupled superfluid in 2+1 dimensions. The system is evaluated in numerical real-time simulations in order to study the evolution of the vortices as they approach and eventually annihilate each other. A tracking algorithm with sub-plaquette resolution is introduced which permits a high-precision determination of the vortex trajectories. With the increased precision of the trajectories it becomes possible to directly compute the vortex velocities and accelerations. We find that in the holographic superfluid the vortices follow universal trajectories independent of their initial separation, indicating that a vortex-anti-vortex pair is fully characterized by its separation. Subtle non-universal effects in the vortex motion at early times of the evolution can be fully attributed to artifacts due to the numerical initialization of the vortices. We also study the dependence of the dynamics on the temperature of the superfluid.
