Kavli Affiliate: Shigeki Matsumoto
| First 5 Authors: Shigeki Matsumoto, Jie Sheng, Chuan-Yang Xing, Lin Zhu,
| Summary:
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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