Abstract
A brief overview on standard big bang nucleosynthesis (shortly, SBBN) is presented. First, we describe the outcome of the SBBN concerning the abundances of the light elements up to 7Li. A comparison with observations reveals a Lithium overproduction, which is not understood yet and is termed as “Cosmological Lithium Problem”. Resolving that problem is not easy, since many aspects are involved whichnuclear, astrophysical and even a non-standard scenario may be invoked. These items are described in some details owing to the limited available space.
Highlights
The standard big bang nucleosynthesis (SBBN) is well understood in the context of the standard model of particle physics
It is clear that all abundances agree with observations except for Lithium which is higher by a factor of 3 than observations
The possibility of an astrophysical solution is unlikely [13] because it will be constrained by the plateau at high metallicity
Summary
The standard big bang nucleosynthesis (SBBN) is well understood in the context of the standard model of particle physics. Lithium was shown to have a constant behavior as function of metallicity, so called "Spite Plateau"[17]. Such a behavior is in conflict with recent observations at very low metallicity which makes the Lithium problem more complicated.
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