TL;DR
Primordial nucleosynthesis accurately predicts element abundances from the Big Bang, but the lithium problem remains unresolved, with recent observations constraining possible solutions.
Contribution
This paper reviews the current status of primordial nucleosynthesis, highlighting the lithium discrepancy and the impact of recent deuterium measurements on theoretical models.
Findings
Predictions align well with most observations.
The lithium abundance discrepancy persists.
Recent deuterium data constrain solutions to the lithium problem.
Abstract
Primordial or big bang nucleosynthesis (BBN) is now a parameter free theory whose predictions are in good overall agreement with observations. However, the 7Li calculated abundance is significantly higher than the one deduced from spectroscopic observations. Most solutions to this lithium problem involve a source of extra neutrons that inevitably leads to an increase of the deuterium abundance. This seems now to be excluded by recent deuterium observations that have drastically reduced the uncertainty on D/H and also calls for improved precision on thermonuclear reaction rates.
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