The Uncertainty in Newton's Constant and Precision Predictions of the Primordial Helium Abundance

Details The Uncertainty in Newton's Constant and Precision Predictions of the Primordial Helium Abundance The Uncertainty in Newton's Constant and Precision Predictions of the Primordial Helium Abundance

2003-10-23

arxiv.org/abs/astro-ph/0310699v3

Phys.Rev.D69:107302,2004

Astronomy and Astrophysics

Astrophysics

3 pages, no figures, fixed typos, to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.69.107302

The current uncertainty in Newton's constant, G_N, is of the order of 0.15%. For values of the baryon to photon ratio consistent with both cosmic microwave background observations and the primordial deuterium abundance, this uncertainty in G_N corresponds to an uncertainty in the primordial 4He mass fraction, Y_P, of +-1.3 x 10^{-4}. This uncertainty in Y_P is comparable to the effect from the current uncertainty in the neutron lifetime, which is often treated as the dominant uncertainty in calculations of Y_P. Recent measurements of G_N seem to be converging within a smaller range; a reduction in the estimated error on G_N by a factor of 10 would essentially eliminate it as a source of uncertainty in the calculation of the primordial 4He abundance.

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