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• W1991637638 abstract "We study the change of the effective fine structure constant in the cosmological models of a scalar field with a nonvanishing coupling to the electromagnetic field. Combining cosmological data and terrestrial observations we place empirical constraints on the size of the possible coupling and explore a large class of models that exhibit tracking behavior. The change of the fine structure constant implied by the quasar absorption spectra together with the requirement of tracking behavior impose a lower bound of the size of this coupling. Furthermore, the transition to the quintessence regime implies a narrow window for this coupling around ${10}^{ensuremath{-}5}$ in units of the inverse Planck mass. We also propose a nonminimal coupling between electromagnetism and quintessence which has the effect of leading only to changes of alpha determined from atomic physics phenomena, but leaving no observable consequences through nuclear physics effects. In doing so we are able to reconcile the claimed cosmological evidence for a changing fine structure constant with the tight constraints emerging from the Oklo natural nuclear reactor." @default.
• W1991637638 created "2016-06-24" @default.
• W1991637638 creator A5000856599 @default.
• W1991637638 creator A5006432839 @default.
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• W1991637638 date "2004-01-06" @default.
• W1991637638 modified "2023-10-16" @default.
• W1991637638 title "Models of quintessence coupled to the electromagnetic field and the cosmological evolution of alpha" @default.
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• W1991637638 doi "https://doi.org/10.1103/physrevd.69.023501" @default.
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