Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The QCD Axion and Moduli Stabilisation   We investigate the conditions for a QCD axion to coexist with stabilised
moduli in string compactifications. We show how the simplest approaches to
moduli stabilisation give unacceptably large masses to the axions. We observe
that solving the F-term equations is insufficient for realistic moduli
stabilisation and give a no-go theorem on supersymmetric moduli stabilisation
with unfixed axions applicable to all string compactifications and relevant to
much current work. We demonstrate how nonsupersymmetric moduli stabilisation
with unfixed axions can be realised. We finally outline how to stabilise the
moduli such that f_a is within the allowed window 10^9 GeV < f_a < 10^{12} GeV,
with f_a ~ \sqrt{M_{SUSY} M_P}.

12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
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The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
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The categories of this paper are: eess