Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Theoretical Explanation of the Cosmic Ray Perpendicular Diffusion
  Coefficient in the Nearby Starburst Galaxy NGC 253   Diffusion coefficients are usually used to describe the propagation of Cosmic
Rays through the Universe. Whereas such transport parameters can be obtained
from experiments in the Solar System, it is difficult to determine diffusion
coefficients in the Milky Way or in external galaxies. Recently a value for the
perpendicular diffusion coefficient in the nearby starburst halaxy NGC 253 has
been proposed. In the present paper we reproduce this value theoretically by
using an advanced analytical theory for perpendicular diffusion.

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The categories of this paper are: physics
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
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The categories of this paper are: gr-qc
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The categories of this paper are: math
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The categories of this paper are: hep-th
16
The categories of this paper are: stat
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The categories of this paper are: cs
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol