Instabilities in relativistic two-component (super)fluids
Oct 7, 2015
23 pages
Published in:
- Phys.Rev.D 93 (2016) 2, 025011
- Published: Jan 14, 2016
e-Print:
- 1510.01982 [hep-ph]
View in:
Citations per year
Abstract: (APS)
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.Note:
- 25 pages, 7 figures, v2: minor modifications; references added; parts of Sec III.B moved into new appendix B; version published in Phys. Rev. D
- fluid: velocity
- boson: coupling
- stability
- field theoretical model
- nonrelativistic
- neutron star
- transverse
- superfluid
References(57)
Figures(11)
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