Big-Bang Nucleosynthesis: lithium problems and scalar-tensor theories of gravity

Journal Article · Wed Jul 12 04:00:00 EDT 2006 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2234378· OSTI ID:20877433

Coc, Alain ^[1]

---

1. Centre de Spectrometrie Nucleaire et de Spectrometrie de Masse, Batiment 104, F-91405 Orsay Campus (France)

The observations of the anisotropies of the Cosmic Microwave Background (CMB) radiation, by the WMAP satellite, has provided a determination of the baryonic density of the Universe ({omega}bh2) with an unprecedented precision. Using this value, the primordial abundances of the light elements can be calculated in the framework of the Standard Big-Bang Nucleosynthesis model (SBBN). While the agreement is excellent for D and good for 4He, there is a difference of a factor of {approx_equal}3 for 7Li. In addition, in a few halo stars, 6Li has also been observed at a level well above SBBN predictions. To enable a more reliable calculation of these 7Li and 6Li yields, two nuclear reactions important for the nucleosynthesis of 7Li and 6Li have been studied experimentally: D({alpha}, {gamma})6Li and 7Be(d,p)2{alpha}. Even though, the lithium primordial production is not well understood, BBN can be used to constrain theories beyond the standard model, for instance, scalar-tensor theories of gravity.

• OSTI ID: 20877433
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 847; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ALPHA REACTIONS
ANISOTROPY
BACKGROUND RADIATION
BARYONS
BERYLLIUM 7
BERYLLIUM 7 TARGET
COSMOLOGY
DENSITY
DEUTERIUM TARGET
ELEMENT ABUNDANCE
GRAVITATION
HELIUM 4
LITHIUM 6
LITHIUM 7
NUCLEAR REACTION YIELD
NUCLEOSYNTHESIS
RELICT RADIATION
SCALARS
STANDARD MODEL
TENSORS