A New Nucleosynthesis Constraint on the Variation of G

Abstract

Big Bang Nucleosynthesis can provide, via constraints on the expansion rate at that time, limits on possible variations in Newton's Constant, $G$. The original analyses were performed before an independent measurement of the baryon-to-photon ratio from the cosmic microwave background was available. Combining this with recent measurements of the primordial deuterium abundance in quasar absorption systems now allows one to derive a new tighter constraint on $G$ without recourse to considerations of helium or lithium abundances. We find that, compared to todays value, $G_0$, $G_{BBN}/G_0=1.01_{-0.16}^{+0.20}$ at the 68.3% confidence level. If we assume a monotonic power law time dependence, $G\propto t^{-\alpha }$, then the constraint on the index is $-0.004<\alpha <0.005$. This would translate into $-3\times 10^{-13}{\text{yr}}^{-1}<(\dot{G}/G{)}_{\text{today}}<4\times 10^{-13}{\text{yr}}^{-1}$.

arXiv comment3 pages revtex including 1 figure

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