Limits on the changes in the gravitational constant from nucleosynthesis |
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Authors: | A S Al-Rawaf |
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Institution: | (1) Physics Department, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia |
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Abstract: | Due to the recent all-sky, high-precision measurement of microwave background anisotropies by WMAP, a value for baryon-to-photon
ratio η was obtained. At the WMAP value for η, the 4HE abundance was predicted. In this article we use a simple semi-analytical method with 4He predicted and measured values to place a limit on the variation of the gravitational constant G. We find using a conservative range for the measured values for Y
p
, that ΔG/G is constrained between −0.26 and 0.15. If we assume a monotonic power law time dependence G∼t
−β
then β values is constrained between −0.008 and 0.0038, which translate into
. This compares well with results obtained by others using full numerical analysis.
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Keywords: | Cosmology Variation of G |
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