Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Thermal conductivity due to phonons in the core of superfluid neutron
  stars   We compute the contribution of phonons to the thermal conductivity in the
core of superfluid neutron stars. We use effective field theory techniques to
extract the phonon scattering rates, written as a function of the equation of
state of the system. We also calculate the phonon dispersion law beyond linear
order, which depends on the gap of superfluid neutron matter. With all these
ingredients, we solve the Boltzmann equation numerically using a variational
approach. We find that the thermal conductivity $\kappa$ is dominated by
combined small and large angle binary collisions. As in the color-flavor-locked
superfluid, we find that our result can be well approximated by $\kappa \propto
1/ \Delta^6$, where $\Delta$ is the neutron gap, the constant of
proportionality depending on the density. We further comment on the possible
relevance of electron and superfluid phonon collisions in obtaining the total
contribution to the thermal conductivity in the core of superfluid neutron
stars.

8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph