Searching for dark matter with a 1000 km baseline interferometer

Abstract

Axion-like particles (ALPs) arise from well-motivated extensions to the Standard Model and could account for dark matter. ALP dark matter would manifest as a field oscillating at an (as of yet) unknown frequency. The frequency depends linearly on the ALP mass and plausibly ranges from $10^{-22}$ to $10$ eV/$c^2$. This motivates broadband search approaches. We report on a direct search for ALP dark matter with an interferometer composed of two atomic K-Rb-${}^3$He comagnetometers, one situated in Mainz, Germany, and the other in Kraków, Poland. We leverage the anticipated spatio-temporal coherence properties of the ALP field and probe all ALP-gradient-spin interactions covering a mass range of nine orders of magnitude. No significant evidence of an ALP signal is found. We thus place new upper limits on the ALP-neutron, ALP-proton and ALP-electron couplings reaching below $g_{aNN}<10^{-9}$ GeV${}^{-1}$, $g_{aPP}<10^{-7}$ GeV${}^{-1}$ and $g_{aee}<10^{-6}$ GeV${}^{-1}$, respectively. These limits improve upon previous laboratory constraints for neutron and proton couplings by up to three orders of magnitude.

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Cited by in corpus (2)

• Cavity, lumped-circuit, and spin-based detection of axion dark matter: differences and similarities
• Search for a solar-bound axion halo using the Global Network of Optical Magnetometers for Exotic physics searches