Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cosmic Ray Protons Illuminate Dark Matter Axions   Cosmic ray protons propagating in a spatially-homogeneous but time-dependent
field of axions or axion-like particles (ALPs) emit photons in a way that is
reminiscent of Cherenkov radiation by charged particles in a preferred
background. We compute the emission rate and energy spectrum of the photons,
and discuss the possibility of their detection using the Square Kilometre Array
which is currently under construction. In the case of a non-detection,
constraints can be placed on the parameter space of ALPs whose mass lie between
$10^{-7}$eV and $10^{-5}$ eV under the assumption that they are the primary
constituent of dark matter.

15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
4
The categories of this paper are: cond-mat
3
The categories of this paper are: physics
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg