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The Axion Dark Matter eXperiment (ADMX) has previously excluded Dine-Fischler-Srednicki-Zhitnisky (DFSZ) axions between 680–790 MHz under the assumption that the dark matter is described by the isothermal halo model. However, the precise nature of the velocity distribution of dark matter is still unknown, and alternative models have been proposed. We report the results of a nonvirialized axion search over the mass range 2.81–3.31 μeV, corresponding to the frequency range 680–800 MHz. This analysis marks the most sensitive search for nonvirialized axions sensitive to Doppler effects in the Milky Way Halo to date. Accounting for frequency shifts due to the detector's motion through the Galaxy, we exclude cold flow relic axions with a velocity dispersion of O(10−7)c with 95% confidence.1 MoreReceived 17 November 2023Accepted 14 February 2024DOI:https://doi.org/10.1103/PhysRevD.109.083014© 2024 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasCosmologyDark matterParticle dark matterPhysical SystemsAxionsTechniquesDark matter detectorsParticles & Fields
Bartram et al. (Wed,) studied this question.