Possible variations of the fine structure constant $α$ and their metrological significance

We briefly review the recent experimental results on possible variations of the fine structure constant $α$ on the cosmological time scale and its position dependence. We outline the theoretical grounds for the assumption that $α$ might be variable, mention some phenomenological models incorporating a variable $α$ into the context of modern cosmology and discuss the significance of possible $α$ variations for theoretical and practical metrology.

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