We discuss gauge models in which exchange of Goldstone bosons combined with the QCD anomaly can lead to spin-independent 1/R and T-nonconserving {σ}{·}r^/R² potential. In contrast with axion-exchange forces which lead to new short-range macroscopic forces (range {~}10 cm), these forces could be observable in E\"otv\"os-Dicke--type experiments involving polarized and unpolarized materials.
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Chang et al. (1985) studied this question.
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