Search for solar Kaluza-Klein axions in theories of low-scale quantum gravity

Abstract

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 $M_{\mathrm{F}}$ 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 $M_{\mathrm{F}}=1$ 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.

19 pages, extended version, as to appear in Physical Review D

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• Axion model in extra dimensions with TeV scale gravity
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