Limits on the Variability of Physical Constants
Abstract
We have compared the frequency of high-redshift Hydrogen HI 21 cm absorption with that of associated molecular absorption in two quasars to place new (1 sigma) upper limits on any variation in y = gp.alpha2 (where alpha is the fine structure constant and gp is the proton g-factor) of |Delta(y)/y| < 5.10-6 at redshifts z=0.25 and z=0.68.
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