Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-04-04
Int.J.Mod.Phys. D11 (2002) 1137-1148
Astronomy and Astrophysics
Astrophysics
13 pages including 3 figures; delivered at First Int ASTROD School and Symposium, Sep 13-23, 2001, Beijing, to appear in Int.
Scientific paper
10.1142/S0218271802002621
In 1976, Shlyakhter showed that the Sm data from Oklo results in the upper bound on the time-variability of the fine-structure constant: $|\dot{\alpha}/\alpha| \lsim 10^{-17}{\rm y}^{-1}$, which has ever been the most stringent bound. Since the details have never been published, however, we recently re-analyzed the latest data according to Shlyakhter's recipe. We nearly re-confirmed his result. To be more precise, however, the Sm data gives either an upper-bound or an "evidence" for a changing $\alpha$: $\dot{\alpha}/\alpha = -(0.44 \pm 0.04)\times 10^{-16}{\rm y}^{-1}$. A remark is made to a similar re-analysis due to Damour and Dyson. We also compare our result with a recent "evidence" due to Webb et al, obtained from distant QSO's. We point out a possible connection between this time-dependence and the behavior of a scalar field supposed to be responsible for the acceleration of the universe, also revealed recently.
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