A search for non-virialized axionic dark matter

TL;DR

This paper reports on a search for axionic dark matter in low velocity dispersion flows within the Milky Way, setting new limits on axion densities over a specific mass range using high-resolution spectral analysis.

Contribution

It introduces a combined power spectra analysis method for axion detection sensitive to low velocity dispersion flows, providing new exclusion limits on axion dark matter densities.

Findings

Excluded KSVZ axion densities > 0.2 GeV/cm^3

Excluded DFSZ axion densities > 1.4 GeV/cm^3

Covered axion mass range 3.3 to 3.69 μeV

Abstract

Cold dark matter in the Milky Way halo may have structure defined by flows with low velocity dispersion. The Axion Dark Matter eXperiment high resolution channel is especially sensitive to axions in such low velocity dispersion flows. Results from a combined power spectra analysis of the high resolution channel axion search are presented along with a discussion of the assumptions underlying such an analysis. We exclude KSVZ axion dark matter densities of {\rho} > 0.2 GeV/cm^3 and DFSZ densities of {\rho} > 1.4 GeV/cm^3 over a mass range of m_a = 3.3{\mu}eV to 3.69{\mu}eV for models having velocity dispersions of {\Delta}{\beta} < 3x10^-6.