Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: \nu \bar{\nu} -Pair Synchrotron Emission in Neutron-Star Matter based on
  a Relativistic Quantum Approach   We study the neutrino anti-neutrino pair synchrotron emission from electrons
and protons in a relativistic quantum approach. This process occurs only under
a strong magnetic field, and it is considered to be one of effective processes
for neutron star cooling. In this work we calculate the luminosity of the
neutrino anti-neutrino pairs emitted from neutron-star-matter with a magnetic
field of about 10^{15} G. We find that the energy loss is much larger than that
of the modified Urca process. The neutrino anti-neutrino pair emission
processes in strong magnetic fields is expected to contribute significantly to
the cooling of the magnetars.

14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs