Instabilities in relativistic two-component (super)fluids
Instabilities in relativistic two-component (super)fluids
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相对论双组分（超）流体的不稳定性
DOI：
10.1103/physrevd.93.025011
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发表时间：
2016
影响因子：
5
通讯作者：
Haber A
中科院分区：
文献类型：
--
作者：
Haber A
我们研究了具有非零流体速度的双流体系统，并计算了它们的声模，这些声模表明了各种不稳定性。对于两个零温超流体的情况下，我们采用一个微观场理论模型的两个耦合玻色子场，包括夹带耦合和非夹带耦合。本文系统地分析了各种不稳定性的发生，指出只有在超过朗道临界速度时，才能发生动力学双流不稳定性，在一个能量已经不稳定的政权。一个定性的差异被发现的情况下，两个正常的流体，其中某些横向模式遭受两个流的不稳定性在一个积极稳定的制度，如果有夹带之间的流体。由于我们的工作在一个完全相对论的设置，我们的结果是非常普遍的，并在中子星（超）流体的潜在相关性，在非相对论的限制，我们的结果，在实验室。
We study two-fluid systems with nonzero fluid velocities and compute their sound modes, which indicate various instabilities. For the case of two zero-temperature superfluids we employ a microscopic field-theoretical model of two coupled bosonic fields, including an entrainment coupling and a nonentrainment coupling. We analyze the onset of the various instabilities systematically and point out that the dynamical two-stream instability can occur only beyond Landau’s critical velocity, i.e., in an already energetically unstable regime. A qualitative difference is found for the case of two normal fluids, where certain transverse modes suffer a two-stream instability in an energetically stable regime if there is entrainment between the fluids. Since we work in a fully relativistic setup, our results are very general and are of potential relevance for (super)fluids in neutron stars and, in the nonrelativistic limit of our results, in the laboratory.