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 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 by Proment and Krstulovic [Phys. Rev. Fluids 5, 104701 (2020)], 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.

中文翻译：

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量子流体中涡旋重新连接的不可逆动力学

我们通过使用Gross–Pitaevskii模型发展涡旋Hopf链的不同实现来对量子流体中的涡旋重新连接进行统计研究。尽管模型具有时间可逆性，但我们报告了清晰的证据，表明重新连接过程的动力学是时间不可逆的，因为重新连接的涡流往往比它们分离的速度快。得益于Proment和Krstulovic [ Phys。修订版液 5，104701（2020）]，我们定量涉及这种不对称到声音脉冲的产生重新连接事件后的原点。我们的结果具有在多个量子流体实验中进行测试的前景，并且从理论上讲，可以为经典湍流和量子湍流中的能量转移机理提供新的思路。