Effects of possible deviations of fundamental physical constants on primordial nucleosynthesis |
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| Authors: | A V Ivanchik A V Orlov D A Varshalovich |
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| Institution: | (1) Ioffe Physicotechnical Institute, ul. Politekhnicheskaya 26, St. Petersburg, 194021, Russia |
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| Abstract: | We study the effects of possible deviations of fundamental physical constants on the yields of light nuclides, 2D, 3He, 4He, 7Li, and others during primordial nucleosynthesis. The deviations of fundamental constants from their current values are considered in the low-energy approximation of string theories; the latter predict the existence of a scalar field, which, apart from the tensor gravitational field, determines the space geometry. A two-parameter (η, δ) model is constructed for primordial nucleosynthesis: η = n B /n γ is the baryon-to-photon density ratio, and Ω is the relative deviation of fundamental physical constants at the epoch of primordial nucleosynthesis from their current values. A dependence of η on the deviation of coupling constants Ω has been derived on condition that the primordial helium abundance is Y p = f(η, δ) = const, where const corresponds to experimental values. We thus showed that the relative baryonic density (and hence ΩB could vary over a much wider range than allowed by the standard nucleosynthesis model. Considering this result, we discuss the recently found mismatch between ΩB obtained from an analysis of CMBR anisotropy and from the standard primordial nucleosynthesis model. |
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| Keywords: | theoretical and observational cosmology |
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