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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

[154–157]

Meteorite dating

∼10−16

[158]

MICROSCOPE (indirect limits)

∼10−17–10−23

[14, 137, 138]