Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Mass flows and angular momentum density for $p_x+ip_y$ paired fermions
  in a harmonic trap   We present a simple two-dimensional model of a $p_x+ip_y$ superfluid in which
the mass flow that gives rise to the intrinsic angular momentum is easily
calculated by numerical diagonalization of the Bogoliubov-de Gennes operator.
We find that, at zero temperature and for constant director $\bf l$, the mass
flow closely follows the Ishikawa-Mermin-Muzikar formula ${\bf j}_{\rm mass}=
\frac 12 {\rm curl} (\rho \hbar {\bf l}/2)$.

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The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
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The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
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The categories of this paper are: dg-ga
2
The categories of this paper are: math
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The categories of this paper are: alg-geom
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The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
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The categories of this paper are: solv-int
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The categories of this paper are: adap-org
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The categories of this paper are: eess
30
The categories of this paper are: q-alg