Does the Fine-Structure Constant Vary with Cosmic Time?

Details Does the Fine-Structure Constant Vary with Cosmic Time? Does the Fine-Structure Constant Vary with Cosmic Time?

Nov 1967

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967phrvl..19.1294b&link_type=abstract

Physical Review Letters, vol. 19, Issue 22, pp. 1294-1295

Physics

67

Scientific paper

The fine structure constant at red shifts Δλλ~0.2,
corresponding to an epoch around two billion years ago, has been
determined using the wavelengths of a pair of O III emission lines
measured in the spectra of five radio galaxies. We find
α(z=0.2)α(lab)=1.001+/-0.002 probable error.

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