Was the fine-structure constant variable over cosmological time?
Ho Chi Minh City Institute of Physics - 01 Mac Dinh Chi Street, District I, Ho Chi Minh City, Vietnam
2 Hanoi Institute of Physics - 10 Bo Ho, Dao Tan District, Ba Dinh, Hanoi, Vietnam
3 Research and Development Center for Radiation Technology - 202A Street 11, Linh Xuan Ward, Thu Duc District, Ho Chi Minh City, Vietnam
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Cosmological variation of the fine-structure constant (α) depends on the redshifts of quasars. Using the emission (absorption) systems in the spectra of distant quasars, we investigate the effect of the cosmology variability in the value of the fine-structure constant (α) dependent on the redshifts of quasars during the evolution of Universe. We obtain optical spectra of fine-structure transitions in [NeIII], [NeV], [OIII, [OI], and [SII] multiplets from a sample of 14 Seyfert 1.5 galaxies in the low-z range. 0.035 < z < 0.281. Each source and each multiplet is independently analyzed to ascertain possible errors. Averaging over our sample, we obtain a conservative value (t)/(0) = 0.999965 ± 0.00005529.
PACS: 98.80.Es – Observational cosmology (including Hubble constant, distance scale, cosmological constant, early Universe, etc.) / 98.80.Cq – Particle-theory and field-theory models of the early Universe (including cosmic pancakes, cosmic strings, chaotic phenomena, inflationary universe, etc.) / 06.20.Jr – Determination of fundamental constants
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