Article

Astrophysics

, Volume 53, Issue 3, pp 446-452

Constraining the cosmological time variation of the fine - structure constant

  • Le Duc ThongAffiliated withHo Chi Minh City Institute of Physics Email author 
  • , Tran van HungAffiliated withResearch and Development Center for Radiation Technology
  • , Nguyen Thi Thu HuongAffiliated withLaboratory for High Energy Physics and Cosmology, Faculty of Physics, Vietnam National University
  • , Ha Huy BangAffiliated withLaboratory for High Energy Physics and Cosmology, Faculty of Physics, Vietnam National University

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The variation of the fine-structure constant α = e 2 / ħc 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 .

Keywords

Cosmology observations - line profiles - quasars absorption lines