Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Braking indices and spin evolution: something is loose inside neutron
  stars   Braking indices are used to describe the evolution of pulsars rotation, and
can offer insights into the braking mechanism that dominates the slow down.
Here we discuss the main difficulties associated with measuring braking indices
and the complexity of interpreting these measurements. Considering recent
braking index measurements on pulsars with large and regular glitches, we
comment on the significant effects that the loosely coupled superfluid inside
pulsars might have on their spin evolution.

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The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
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The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
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The categories of this paper are: eess
8
The categories of this paper are: hep-ex
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The categories of this paper are: nucl-th