Dissipation makes the relativistic two-stream instability dynamical exactly at the counterflow velocity where an ideal fluid would only show an energetic instability.
Landau and Dynamical Instabilities of the Superflow of Bose-Einstein Condensates in Optical Lattices
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abstract
The superfluidity of Bose-Einstein condensates in optical lattices are investigated. Apart from the usual Landau instability which occurs when a BEC flows faster than the speed of sound, the BEC can also suffer a dynamical instability, resulting in period doubling and other sorts of symmetry breaking of the system. Such an instability may play a crucial role in the dissipative motion of a trapped BEC in an optical lattice recently observed [1].
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2019 1verdicts
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Dissipation triggers dynamical two-stream instability
Dissipation makes the relativistic two-stream instability dynamical exactly at the counterflow velocity where an ideal fluid would only show an energetic instability.