Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The entrainment matrix of a superfluid neutron-proton mixture at a
  finite temperature   The entrainment matrix (also termed the Andreev-Bashkin matrix or the
mass-density matrix) for a neutron-proton mixture is derived at a finite
temperature in a neutron star core. The calculation is performed in the frame
of the Landau Fermi-liquid theory generalized to account for superfluidity of
nucleons. It is shown, that the temperature dependence of the entrainment
matrix is described by a universal function independent on an actual model of
nucleon-nucleon interaction employed. The results are presented in the form
convenient for their practical use. The entrainment matrix is important, e.g.,
in kinetics of superfluid nucleon mixtures or in studies of the dynamical
evolution of neutron stars (in particular, in the studies of star pulsations
and pulsar glitches).

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The categories of this paper are: q-bio
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The categories of this paper are: alg-geom
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-th
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The categories of this paper are: physics
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The categories of this paper are: dg-ga
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The categories of this paper are: q-fin
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The categories of this paper are: stat
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The categories of this paper are: ao-sci
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The categories of this paper are: adap-org
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The categories of this paper are: chem-ph
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The categories of this paper are: supr-con
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The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
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The categories of this paper are: math
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The categories of this paper are: nlin