Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Collective modes of the order parameter in a triplet superfluid neutron
  liquid   The complete spectrum of collective modes of the triplet order parameter in
the superfluid neutron matter is examined in the BCS approximation below the
pair-breaking threshold. The dispersion equations both for the unitary and
nonunitary excitations are derived and solved in the limit of $q\rightarrow0$
by taking into account the anisotropy of the energy gap for the case of
$P$-wave pairing. By our analysis, there is only one Goldstone mode which is
associated with the broken gauge symmetry. We found no additional Goldstone
modes associated with the broken rotational symmetry but found that the
oscillations of the total angular momentum are qualitatively similar to the
"normal-flapping" mode in the A-phase of superfluid Helium. There are also two
collective modes associated with internal vibrations of the structure of the
order parameter oscillating with $\omega(T=0) =1.20\Delta_{0}$ and $\omega(T=0)
=0.61\Delta_{0}$.

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The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
2
The categories of this paper are: math