Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Merger-inspired rotation laws and the low-T/W instability in neutron
  stars   Implementing a family of differential rotation laws inspired by binary
neutron-star merger remnants, we consider the impact of the rotation profile on
the low-T/W instability. We use time evolutions of the linearised dynamical
equations, in Newtonian gravity, to study non-axisymmetric oscillations and
identify the unstable modes. The presence and evolution of the low-T/W
instability is monitored with the canonical energy and angular momentum, while
the growth time is extracted from the evolved kinetic energy. The results for
the new rotation laws highlight similarities with the commonly considered
j-constant law. The instability sets in when an oscillation mode co-rotates
with the star (i.e. whenever there is a point where the mode's pattern speed
matches the bulk angular velocity) and grows faster deep inside the co-rotation
region. However, the new profiles add features, like an additional co-rotation
point to the problem, which affect the onset of instability. The rotation laws
influence more drastically the oscillation frequencies of the l=m=2 f-mode in
fast rotating models, but affect the instability growth time at any rotation
rate. We also identify models where the low-T/W instability appears to be
triggered by inertial modes. We discuss to what extent the inferred qualitative
behaviour is likely to be of observational relevance.

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The categories of this paper are: math
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph