Limits on the Variability of Physical Constants
Drinkwater, M. J. · Webb, J. K. · Barrow, J. D. · Flambaum, V. V.
Original · EN
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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