Hunting for Ultralight Bosonic Dark Matter in the Wilderness: the Search for Non-Interacting Particles Experimental Hunt (SNIPE Hunt)*

Recently, it was proposed that the Earth itself could act as a transducer for ultralight dark-matter detection [1,2]. In particular, interaction of kinetically mixed hidden-photon or axion-like particle (ALP) dark matter with the Earth generates a characteristic coherent magnetic field signal pattern across the surface of the Earth that can be searched for using unshielded magnetometers [2,3]. We report on the results of a coordinated measurement campaign in July 2022 to search for signals from ultralight bosonic dark matter with Compton frequencies in the 1-5 Hz range. The campaign consisted of performing simultaneous, correlated measurements with atomic magnetometers at geographically separated, relatively quiet magnetic environments (far from human-generated magnetic noise).

[1] M. A. Fedderke, P. W. Graham, D. F. Jackson Kimball, and S. Kalia, Phys. Rev. D 104, 075023 (2021).

[2] A. Arza, M. A. Fedderke, P. W. Graham, D. F. Jackson Kimball, and S. Kalia, Phys. Rev. D 105, 095007 (2022).

[3] M. A. Fedderke, P. W. Graham, D. F. Jackson Kimball, and S. Kalia, Phys. Rev. D 104, 095032 (2021).