Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Photophilic hadronic axion from heavy magnetic monopoles   We propose a model for the QCD axion which is realized through a coupling of
the Peccei-Quinn scalar field to magnetically charged fermions at high
energies. We show that the axion of this model solves the strong CP problem and
then integrate out heavy magnetic monopoles using the Schwinger proper time
method. We find that the model discussed yields axion couplings to the Standard
Model which are drastically different from the ones calculated within the
KSVZ/DFSZ-type models, so that large part of the corresponding parameter space
can be probed by various projected experiments. Moreover, the axion we
introduce is consistent with the astrophysical hints suggested both by
anomalous TeV-transparency of the Universe and by excessive cooling of
horizontal branch stars in globular clusters. We argue that the leading term
for the cosmic axion abundance is not changed compared to the conventional
pre-inflationary QCD axion case for axion decay constant $f_a >
10^{12}~\text{GeV}$.

11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math
17
The categories of this paper are: q-fin