Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nonlinear dynamics of coupled superfluids   Following recent experiments on ultracold dual superflows, we model in this
work the dynamics of two harmonically trapped counterflowing superfluids. Using
complementary analytical and numerical approaches, we study the shedding of
elementary excitations triggered by the relative motion of the two species. We
exhibit two different excitation mechanisms leading to distinct threshold
velocities for the onset of dissipation: in addition to the parametric pair
production present in homogeneous , galilean-invariant systems, we show that
non-uniform motion and density inhomogeneities allow for a Landau-like decay
mechanism where single excitations are produced.

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The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
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The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
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The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph