Nucleosynthesis and the Time Dependence of Fundamental Couplings

Details Nucleosynthesis and the Time Dependence of Fundamental Couplings Nucleosynthesis and the Time Dependence of Fundamental Couplings

1994-11-11

arxiv.org/abs/hep-ph/9411272v1

Phys.Lett.B345:429-434,1995

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, latex, no figures

Scientific paper

10.1016/0370-2693(94)01652-S

We consider the effects of the time dependence of couplings due to their dependence on a dilaton field, as occurs in superstring theory, as well as in gravity theories of the Jordan-Brans-Dicke type. Because the scale parameters of couplings set by dimensional transmutation depend exponentially on the dilaton vev, we may obtain stringent limits on the shift of the dilaton from the requirement that the induced shift in the couplings not vitiate the successful calculations of element abundances for big-bang nucleosynthesis. These limits can be substantially stronger than those obtained directly from the dilaton-induced change in the gravitational coupling.

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