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• W1974862914 abstract "We consider a toy universe containing conventional matter and an additional real scalar field, and discuss how the requirements of gauge and diffeomorphism invariance essentially single out a particular set of theories which might describe such a world at low energies. In these theories, fermion masses and g-factors, as well as the electromagnetic coupling turn to be scalar field dependent; fermion charges and the gravitational coupling might be assumed to be constant. We then proceed to study the impact of a time variation of the scalar field on measurements of atomic spectra at high redshifts. Light propagation is not affected by a sufficiently slow change of the fine structure constant, but changes of the latter as well as variations of fermion masses and g-factors do affect the observed atomic spectra. Finally, we prove the independence of these predictions on the chosen conformal frame, in a further attempt to address differing views about the subject expressed in the literature." @default.
• W1974862914 created "2016-06-24" @default.
• W1974862914 creator A5017781545 @default.
• W1974862914 date "2002-09-13" @default.
• W1974862914 modified "2023-09-27" @default.
• W1974862914 title "Predictions and observations in theories with varying couplings" @default.
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• W1974862914 doi "https://doi.org/10.1103/physrevd.66.064008" @default.
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