Astrophysics

, Volume 53, Issue 3, pp 446–452

Constraining the cosmological time variation of the fine - structure constant

  • Le Duc Thong
  • Tran van Hung
  • Nguyen Thi Thu Huong
  • Ha Huy Bang
Article

DOI: 10.1007/s10511-010-9135-8

Cite this article as:
Duc Thong, L., van Hung, T., Thi Thu Huong, N. et al. Astrophysics (2010) 53: 446. doi:10.1007/s10511-010-9135-8

The variation of the fine-structure constant α = e2 / 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

Cosmologyobservations - lineprofiles - quasarsabsorption lines

Copyright information

© Springer Science+Business Media, Inc. 2010

Authors and Affiliations

  • Le Duc Thong
    • 1
  • Tran van Hung
    • 2
  • Nguyen Thi Thu Huong
    • 3
  • Ha Huy Bang
    • 3
  1. 1.Ho Chi Minh City Institute of PhysicsHo Chi MinhVietnam
  2. 2.Research and Development Center for Radiation TechnologyHanoiVietnam
  3. 3.Laboratory for High Energy Physics and Cosmology, Faculty of PhysicsVietnam National UniversityHanoiVietnam