Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Active Galactic Nuclei and Transformation of Dark Matter into Visible
  Matter   The hypothesis that dark matter is converted into visible particles in active
galactic nuclei is investigated. If dark matter consists of stable superheavy
neutral particles and active galactic nuclei are rotating black holes, then,
due to the Penrose process, superheavy particles can decay into unstable
particles with larger mass, whose decay into quarks and leptons leads to events
in cosmic rays observed by the Auger group. Similar processes of decay of
superheavy particles of dark matter into visible matter occurred in the early
Universe. Numerical estimates of the processes in active galactic nuclei and in
the early Universe are given.

8
The categories of this paper are: hep-ex
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The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
19
The categories of this paper are: eess
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga