Can physical constants vary?
Date: Around 1993
Is it meaningful to claim that physical constants can vary and
that their values are remarkably coincidental? It seems that since they have
never been shown to vary, that one can not claim that their current values are
The changes considered in the constants are over long time
scales. I am not sure that these considerations have yielded explanations of
effects in a compelling way.
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Update: June 2012