Abstract
An analysis of quasar spectra yields highly reliable constraints on the possible variation of the fine-structure constant a and the proton-to-electron mass ratio μ during cosmological evolution from the epoch corresponding to a cosmological red shift z≈2.8 (i.e., ∼1010 years ago) to the current epoch \((z = 0):|\dot \alpha /\alpha | < 2x10^{ - 14} yr^{ - 1} \) and \(|\dot \mu /\mu | < 2x10^{ - 14} yr^{ - 1} \).
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Zh. Tekh. Fiz. 69, 1–5 (September 1999)
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Varshalovich, D.A., Ivanchik, A.V. & Potekhin, A.Y. Do the fundamental physical constants have the same values in different regions of space-time?. Tech. Phys. 44, 1001–1004 (1999). https://doi.org/10.1134/1.1259457
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DOI: https://doi.org/10.1134/1.1259457