Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gravitational Waves from the $r$-mode instability of neutron stars:
  effect of magnetic field   Studies have shown that emission of gravitational wave drives an instability
in the $r$-modes of young rapidly rotating neutron stars carrying away most of
the angular momentum through gravitational wave emission in the first year or
so after their formation. Magnetic field plays a crucial role in the evolution
of these $r$-modes and hence the evolution of the neutron star itself. An
attempt is made here to investigate the role of magnetic field in the evolution
of $r$-mode instability and detectibility of gravitational waves emitted by a
newly born, hot and rapidly and differentially rotating neutron star. It is
found that magnetic field tend to suppress the $r$-mode amplitude. The {\it
signal-to-noise ratio} analysis shows that gravitational waves emitted from the
$r$-mode instability from neutron stars with magnetic fields upto the order of
$10^{14}$ gauss may be detectable by the Advanced LIGO at 20 Mpc.

34
The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
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The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
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The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph
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The categories of this paper are: funct-an
23
The categories of this paper are: solv-int