Has the value of the fine-structure constant changed over the history of the Universe? An earlier analysis of radiation from distant quasars suggested the answer is yes — a new analysis says no.
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Cowie, L., Songaila, A. The inconstant constant?. Nature 428, 132–133 (2004). https://doi.org/10.1038/428132a
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DOI: https://doi.org/10.1038/428132a
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