Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Symmetry breaking in interacting ring-shaped superflows of Bose-Einstein
  condensates   We demonstrate that the evolution of superflows in interacting persistent
currents of ultracold gases is strongly affected by symmetry breaking of the
quantum vortex dynamics. We study counter-propagating superflows in a system of
two parallel rings in regimes of weak (a Josephson junction with tunneling
through the barrier) and strong (rings merging across a reduced barrier)
interactions. For the weakly interacting toroidal Bose-Einstein condensates,
formation of rotational fluxons (Josephson vortices) is associated with
spontaneous breaking of the rotational symmetry of the tunneling superflows.
The influence of a controllable symmetry breaking on the final state of the
merging counter-propagating superflows is investigated in the framework of a
weakly dissipative mean-field model. It is demonstrated that the population
imbalance between the merging flows and the breaking of the underlying
rotational symmetry can drive the double-ring system to final states with
different angular momenta.

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The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: math-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: chao-dyn
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The categories of this paper are: bayes-an
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The categories of this paper are: physics
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The categories of this paper are: alg-geom
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The categories of this paper are: eess
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The categories of this paper are: ao-sci
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The categories of this paper are: astro-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-bio
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-ex