Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An internal mechanism for the anti-glitch observed in AXP 1E 2259+586   Magnetars are fascinating objects that are thought to be neutron stars
powered by their strong internal magnetic fields. Clear evidence of a sudden
spin-down was detected in the Anomalous X-ray Pulsar AXP 1E 2259+586, an object
cataloged as a magnetar. This event received the name "anti-glitch". In this
work we present a simple internal mechanism which could account for the
observed sudden spin-down of the star.

12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga