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Table 1 Summary of bounds on drifts of the electromagnetic fine structure constant α and indirect limits from searches for equivalence-principle-violating forces in the context of the model considered in [146, 147]

From: Measuring the stability of fundamental constants with a network of clocks

Measurement type |dln(α)/dt|/yr Reference
Yb+ clocks 10−18 [20]
Oklo phenomenon 10−17 [154157]
Meteorite dating 10−16 [158]
MICROSCOPE (indirect limits) 10−17–10−23 [14, 137, 138]