Axionic Hot Dark Matter in the Hadronic Axion Window
arXiv:hep-ph/9804291 · doi:10.1016/S0370-2693(98)01091-0
Abstract
Mixed dark matter scenario can reconcile the COBE data and the observed large scale structure. So far the massive neutrino with a mass of a few eV has been the only discussed candidate for the hot dark matter component. We point out that the hadronic axion in the so-called hadronic axion window, f_a \sim 10^6 GeV, is a perfect candidate as hot dark matter within the mixed dark matter scenario. The current limits on the hadronic axion are summarized. The most promising methods to verify the hadronic axion in this window are the resonant absorption of almost-monochromatic solar axions from M1 transition of the thermally excited Fe in the Sun, and the observation of the ``axion burst'' in water Čerenkov detectors from another supernova.
12 pages, 1 figure, LaTeX2e, epsf.sty. Discussions on Moriyama's proposal to detect solar axions without relying on axion-photon-photon coupling and Haxton-Lee bound on axion-nucleon coupling are added. Conclusions unchanged
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