Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gravitational Waves from Neutron Stars: A Review   Neutron stars are excellent emitters of gravitational waves. Squeezing matter
beyond nuclear densities invites exotic physical processes, many of which
violently transfer large amounts of mass at relativistic velocities, disrupting
spacetime and generating copious quantities of gravitational radiation. I
review mechanisms for generating gravitational waves with neutron stars. This
includes gravitational waves from radio and millisecond pulsars, magnetars,
accreting systems and newly born neutron stars, with mechanisms including
magnetic and thermoelastic deformations, various stellar oscillation modes and
core superfluid turbulence. I also focus on what physics can be learnt from a
gravitational wave detection, and where additional research is required to
fully understand the dominant physical processes at play.

29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg