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Constraints on scalar field dark matter from co-located Michelson interferometers
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abstract
Low-mass (sub-eV) scalar field dark matter may induce apparent oscillations of fundamental constants, resulting in corresponding oscillations of the size and the index of refraction of solids. Laser interferometers are highly sensitive to changes in the size and index of refraction of the main beamsplitter. Using cross-correlated data of the Fermilab Holometer instrument, which consists of twin co-located 40-m arm length power-recycled interferometers, we investigate the possible existence of scalar field dark matter candidates in the mass range between 1.6$\cdot$10$^{-12}$ eV and 1.0$\cdot$10$^{-7}$ eV. We set new upper limits for the coupling parameters of scalar field dark matter, improving on limits from previous direct searches by up to three orders of magnitude.
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Searching for Ultralight Dark Matter with M{\"o}ssbauer Resonance
A stationary Mössbauer setup with 109Ag could probe ultralight scalar dark matter couplings down to roughly 10^-18 GeV^-1 (photon), 10^-21 (gluon), and 10^-22 (quark).
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