We develop a scenario in which feeble intermediate-range forces emerge as an effect resulting from the compactification (à la Kaluza-Klein) of a five-dimensional model. It is conjectured that this general strategy will prove applicable to more realistic multidimensional theories such as the ten-dimensional superstring. We speculate that deviations from the standard gravitational force—similar to the ones reported recently as a ‘‘fifth force’’—may be interpreted as evidence for higher dimensions.

• Received 10 March 1986

DOI:https://doi.org/10.1103/PhysRevLett.57.25