Constraining the cosmological time variation of the fine - structure constant

Details Constraining the cosmological time variation of the fine - structure constant Constraining the cosmological time variation of the fine - structure constant

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010ap.....53..446d&link_type=abstract

Astrophysics, Volume 53, Issue 3, pp.446-452

Astronomy and Astrophysics

Astrophysics

Cosmology, Observations, Line, Profiles, Quasars, Absorption Lines

Scientific paper

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

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