The variation of the fine-structure constant α = e² th{stroke}c can be probed by comparing the wavelength of atomic transitions from the redshift of quasars in the Universe and laboratory over cosmological time scales t ~ 10¹⁰ yr. After a careful selection of pairs of lines, the Thong method with a derived analytical expression for the error analysis was applied to compute the α variation. We report a new constraint on the variation of the fine-structure constant based on the analysis of the C_IV, N_V, Mg_II, Al_III, and Si_IV doublet absorption lines. The weighted mean value of the variation in α derived from our analysis over the redshift range 0.4939 ≤ z ≤ 3.7 is = (0.09 ± 0.07)×10^-5. This result is three orders of magnitude better than the results obtained by earlier analysis of the same data on the constraint on Δα/α. © 2010 Springer Science+Business Media, Inc.

Thong L.D., van Hung T., Thu Huong N.T., Bang H.H.

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