Recognition: unknown
Ten Years of the Fifth Force
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The suggestion in 1986 of a possible gravity-like ``fifth" fundamental force renewed interest in the question of whether new macroscopic forces are present in nature. Such forces are predicted in many theories which unify gravity with the other known forces, and their presence can be detected by searching for apparent deviations from the predictions of Newtonian gravity. We review the phenomenology behind searches for a ``fifth force", and present a summary of the existing experimental constraints.
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Fifth-Force Constraints from UV-Complete Scalar-Tensor Gravity
UV completeness in scalar-tensor gravity restricts the fifth-force Yukawa parameters α and λ to a narrow wedge in parameter space, ruling out its complement and part of the experimentally allowed domain.
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