The physical constant just became more constant
In a recent study, physicists placed the strictest limit yet on how much the alpha could change with the density of nearby matter. The method for measuring the constant may help probe whether the value has remained constant over the lifetime of the universe. Read more in Nature Communications.
S. Truppe et al. Nature Communications. Published October 15, 2013. doi: 10.1038/ncomms3600
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