Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-06-02
Grav.Cosmol. 9 (2003) 270-276
Astronomy and Astrophysics
Astrophysics
Latex file, 13 pages, 1 figure and 1 table
Scientific paper
The problem of primordial nucleosynthesis of helium in brane cosmology is studied using a semi-analytical method, where the Fermi-Dirac statistic is ignored. This semi-analytical method agrees with a more complete numerical calculation with a precision of order of 10% or better. The quadratic term for the matter density is the only source considered in the modified Einstein equations predicted by the brane configuration. This hypothesis is justified a posteriori. An agreement between theoretical and observational values for the helium abundance is obtained if the fundamental mass scale in five dimensions is of the order of $M \sim 5\times10^3 GeV$.
Fabris Julio Cesar
Marinho J. A. O.
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