Experimental Constraints on the Axion Dark Matter Halo Density

Abstract

Most of the mass of the Milky Way galaxy is contributed by its halo, presumably in the form of non-interacting cold dark matter. The axion is a compelling cold dark matter candidate. We report results from a search which probes the local galactic halo axion density using the Sikivie RF cavity technique. Candidates over the frequency range 550$$ $\le$ f $\le$$$810MHz(2.3$μ$eV$\le$$$m$_{a}\le$3.4$μ$eV)wereinvestigated.TheabsenceofasignalsuggeststhatKSVZaxionscontributenomorethan0.45GeV/cm$^3$ of mass density to the local dark matter halo over this mass range.

10 pages (includes 3 figures)

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