Using OH 18 cm absorption lines toward PKS 1830-211, the authors place 1-sigma limits of about 6e-5 on changes in alpha times g_p^0.27, 2e-3 on the fine structure constant, and 8e-3 on the proton g-factor over 7.3 Gyr, all consistent with no evolution.
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New constraints on the values of the fundamental constants at a look-back time of 7.3 Gyr
Using OH 18 cm absorption lines toward PKS 1830-211, the authors place 1-sigma limits of about 6e-5 on changes in alpha times g_p^0.27, 2e-3 on the fine structure constant, and 8e-3 on the proton g-factor over 7.3 Gyr, all consistent with no evolution.