Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Shear viscosity and the r-mode instability window in superfluid neutron
  stars   We analyze how recent computations of the shear viscosity $\eta$ in the core
of superfluid neutron stars affect the r-mode instability window. We first
analyze the contribution of superfluid phonons to the viscosity, both in their
hydrodynamical and ballistic regime. We also consider the recent computation of
$\eta$ arising from the collisions of electrons with electrons and protons by
Shternin and Yakovlev, and discuss how the interactions among superfluid
phonons and electrons might contribute to the shear viscosity. For assessing
the r-mode instability window we compare the shear viscosity due to phonons in
the hydrodynamical regime with respect to the shear viscosity due to electron
collisions. Only at high temperatures the superfluid phonon contribution to
$\eta$ starts to dominate the process of r-mode damping. While our results for
the instability window are preliminary, as other dissipative processes should
be taken into account as well, they differ from previous evaluations of the
r-mode damping due to the shear viscosity in superfluid neutron stars.

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The categories of this paper are: nlin
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The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: atom-ph
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-ex
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The categories of this paper are: cs
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The categories of this paper are: patt-sol
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The categories of this paper are: math-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: q-fin
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The categories of this paper are: stat