Physics
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aipc..841..475l&link_type=abstract
A CENTURY OF RELATIVITY PHYSICS: ERE 2005; XXVIII Spanish Relativity Meeting. AIP Conference Proceedings, Volume 841, pp. 475-4
Physics
Origin, Formation, And Abundances Of The Elements, Mathematical And Relativistic Aspects Of Cosmology, Classical General Relativity
Scientific paper
The baryon density of our Universe, Ωbh2 = 0.0224 +/- 0.0009, as inferred from the WMAP first year of observations is used to predict the primordial abundances of light elements produced during Big Bang Nucleosynthesis (BBN). Such a baryon density, and a gravitation described by General Relativity (GR), lead to predictions for the abundances of 4He and D in very good agreement with the observed ones; but they lead to a significant discrepancy between the calculated and the observed 7Li abundances. Supposing that the standard non gravitational sector is not modified, we consider scalar-tensor theories of gravity, and study their impact on the 7Li abundance. It is shown that solving the lithium problem requires a non trivial behaviour of the expansion rate of the Universe at the epoch of BBN, in order not to violate the constraints from 4He and D.
Alimi Jean--Michel
Larena Julien
Serna Arturo
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