论文标题
量子流体中涡流重新连接的不可逆动力学
Irreversible dynamics of vortex reconnections in quantum fluids
论文作者
论文摘要
我们通过使用Gross-Pitaevskii模型来发展涡流Hopf链路的不同实现，从统计地研究量子流体中的涡旋重新连接。尽管该模型具有时间可逆性，但我们报告了一个明确的证据，表明重新连接过程的动力学是可逆的，因为重新连接的涡流往往比它们接近的速度更快。得益于在Proment and Krstulovic（Arxiv：2005.02047）同时设计的匹配理论，我们将这种不对称的起源与重新连接事件后的声音脉冲产生相关。我们的结果的前景是在几个量子流体实验中进行测试，从理论上讲，可能会对经典和量子湍流中的能量传递机理进行新的启示。
We statistically study vortex reconnections in quantum fluids by evolving different realizations of vortex Hopf links using the Gross--Pitaevskii model. Despite the time-reversibility of the model, we report a clear evidence that the dynamics of the reconnection process is time-irreversible, as reconnecting vortices tend to separate faster than they approach. Thanks to a matching theory devised concurrently in Proment and Krstulovic (arXiv:2005.02047), we quantitatively relate the origin of this asymmetry to the generation of a sound pulse after the reconnection event. Our results have the prospect of being tested in several quantum fluid experiments and, theoretically, may shed new light on the energy transfer mechanisms in both classical and quantum turbulent fluids.
