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• W1566359541 abstract "We determine the behavior of a time-varying fine structure ``constant'' $ensuremath{alpha}(t)$ during the early and late phases of universes dominated by the kinetic energy of changing $ensuremath{alpha}(t),$ radiation, dust, curvature, and lambda, respectively. We show that after leaving an initial vacuum-dominated phase during which $ensuremath{alpha}$ increases, $ensuremath{alpha}$ remains constant in universes such as our own during the radiation era, and then increases slowly, proportional to a logarithm of cosmic time, during the dust era. If the universe becomes dominated by a negative curvature or a positive cosmological constant then $ensuremath{alpha}$ tends rapidly to a constant value. The effect of an early period of de Sitter or power-law inflation is to drive $ensuremath{alpha}$ to a constant value. Various cosmological consequences of these results are discussed with reference to recent observational studies of the value of $ensuremath{alpha}$ from quasar absorption spectra and to the existence of life in expanding universes." @default.
• W1566359541 created "2016-06-24" @default.
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• W1566359541 date "2002-02-21" @default.
• W1566359541 modified "2023-10-18" @default.
• W1566359541 title "Behavior of varying-alpha cosmologies" @default.
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• W1566359541 doi "https://doi.org/10.1103/physrevd.65.063504" @default.
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