CÁC BÀI BÁO KHOA HỌC 11:23:19 Ngày 23/09/2020 GMT+7
Constraining the cosmological time variation of the fine - structure constant

The variation of the fine-structure constant α = e2 / h{combining short stroke overlay}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 CIV, NV, MgII, AlIII, and SiIV 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.

 Duc Thong L., van Hung T., Thi Thu Huong N., Huy Bang H.
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