Anomalous vortex-ring velocities induced by thermally excited Kelvin waves and counterflow effects in superfluids
Anomalous vortex-ring velocities induced by thermally excited Kelvin waves and counterflow effects in superfluids
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热激发开尔文波引起的反常涡环速度和超流体中的逆流效应
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
M. Brachet
中科院分区：
文献类型：
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作者：
G. Krstulovic;M. Brachet
研究了截断Gross-Pitaevskii方程下动力逆流对涡旋演化的影响。产生了标准的纵向相互摩擦效应，并在大逆流时得到了涡环的膨胀。观察到一个强烈的温度依赖的涡旋环的异常减速，并归因于热发射开尔文波的存在。用能量均分法估计了有限温度超流体的这种一般效应，并给出了弱相互作用玻色-爱因斯坦凝聚体和超流体$^4{
m He}$的数量级。
Dynamical counterflow effects on vortex evolution under the truncated Gross-Pitaevskii equation are investigated. Standard longitudinal mutual friction effects are produced and a dilatation of vortex rings is obtained at large counterflow. A strong temperature-dependent anomalous slowdown of vortex rings is observed and attributed to the presence of thermally exited Kelvin waves. This generic effect of finite-temperature superfluids is estimated using energy equipartition and orders of magnitude are given for weakly interacting Bose-Einstein condensates and superfluid $^4{
m He}$.