Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Search for solar Kaluza-Klein axions in theories of low-scale quantum
  gravity   We explore the physics potential of a terrestrial detector for observing
axionic Kaluza-Klein excitations coming from the Sun within the context of
higher-dimensional theories of low-scale quantum gravity. In these theories,
the heavier Kaluza-Klein axions are relatively short-lived and may be detected
by a coincidental triggering of their two-photon decay mode. Because of the
expected high multiplicity of the solar axionic excitations, we find
experimental sensitivity to a fundamental Peccei-Quinn axion mass up to
$10^{-2}$ eV (corresponding to an effective axion-photon coupling $g_{a\gamma
\gamma} \approx 2.\times 10^{-12}$ GeV$^{-1}$) in theories with 2 extra
dimensions and a fundamental quantum-gravity scale $M_{\rm F}$ of order 100
TeV, and up to $3.\times 10^{-3}$ eV (corresponding to $g_{a\gamma \gamma}
\approx 6.\times 10^{-13}$ GeV$^{-1}$) in theories with 3 extra dimensions and
$M_{\rm F}=1$ TeV. For comparison, based on recent data obtained from lowest
level underground experiments, we derive the experimental limits: $g_{a \gamma
\gamma} \stackrel{<}{{}_\sim} 2.5\times 10^{-11}$ GeV$^{-1}$ and $g_{a \gamma
\gamma} \stackrel{<}{{}_\sim} 1.2\times 10^{-11}$ GeV$^{-1}$ in the
aforementioned theories with 2 and 3 large compact dimensions, respectively.

18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph