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Torsion Balance Experiments Enable Direct Detection of Sub-eV Dark Matter
Shigeki Matsumoto1, Jie Sheng1,2, Chuan-Yang Xing3
1Kavli IPMU (WPI), UTIAS, University of Tokyo, Kashiwa, 277-8583, Japan.
None:
Light dark matter with sub-eV masses has a high number density in our Galaxy, and its scattering cross section with macroscopic objects can be significantly enhanced by coherence effects. Repeated scattering with a target object can induce a measurable acceleration. Torsion balance experiments with geometric asymmetry are, in principle, capable of detecting such signals. Our analysis shows that existing torsion balances designed to test the equivalence principle already place the most stringent constraints on DM-nucleon scattering in the (10^{-2},1) eV mass range.
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