Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2001-05-17
Braz.J.Phys. 31 (2001) 546-551
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
Latex file, 10 pages
Scientific paper
The synthesis of helium in the early Universe depends on many input parameters, including the value of the gravitational coupling during the period when the nucleosynthesis takes place. We compute the primordial abundance of helium as function of the gravitational coupling, using a semi-analytical method, in order to track the influence of $G$ in the primordial nucleosynthesis. To be specific, we construct a cosmological model with varying $G$, using the Brans-Dicke theory. The greater the value of $G$ at nucleosynthesis period, the greater the abundance of helium predicted. Using the observational data for the abundance of the primordial helium, constraints for the time variation of $G$ are established.
Alvarenga Flavio G.
Fabris Julio Cesar
Goncalves S. V. B.
Marinho J. A. O.
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