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arXiv · 1804.08770

Modulation Sensitive Search for Non-Virialized Dark-Matter Axions

J. Hoskins·N. Crisosto·J. Gleason·P. Sikivie·I. Stern·N. S. Sullivan·D. B. Tanner·C. Boutan·M. Hotz·R. Khatiwada·D. Lyapustin·A. Malagon·R. Ottens·L. J Rosenberg·G. Rybka·J. Sloan·A. Wagner·D. Will·G. Carosi·D. Carter·L. D. Duffy·R. Bradley·J. Clarke·S. O'Kelley·K. van Bibber·E. J. Daw
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Abstract

Non-virialized dark-matter axions may be present in the Milky Way halo in the form of low-velocity-dispersion flows. The Axion Dark Matter eXperiment performed a search for the conversion of these axions into microwave photons using a resonant cavity immersed in a strong, static magnetic field. The spread of photon energy in these measurements was measured at spectral resolutions of the order of 1 Hz and below. If the energy variation were this small, the frequency modulation of any real axion signal due to the orbital and rotational motion of the Earth would become non-negligible. Conservative estimates of the expected signal modulation were made and used as a guide for the search procedure. The photon frequencies covered by this search are 812$-$852 and 858$-$892 MHz, which correspond to an axion mass of 3.36$-$3.52 and 3.55$-$3.69 μeV. No axion signal was found, and limits were placed on the maximum local density of non-virialized axions of these masses.

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J. Hoskins, N. Crisosto, J. Gleason, P. Sikivie, I. Stern, N. S. Sullivan, D. B. Tanner, C. Boutan, M. Hotz, R. Khatiwada, D. Lyapustin, A. Malagon, R. Ottens, L. J Rosenberg, G. Rybka, J. Sloan, A. Wagner, D. Will, G. Carosi, D. Carter, L. D. Duffy, R. Bradley, J. Clarke, S. O'Kelley, K. van Bibber, E. J. Daw. 2018-04-23. Modulation Sensitive Search for Non-Virialized Dark-Matter Axions. https://doi.org/10.1103/physrevd.94.082001

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