English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

For a brief time in its early evolution the Universe was a cosmic nuclearreactor. The expansion and cooling of the Universe limited this epoch to thefirst few minutes, allowing time for the synthesis in astrophysicallyinteresting abundances of only the lightest nuclides (D, 3He, 4He, 7Li). Forbig bang nucleosynthesis (BBN) in the standard models of cosmology and particlephysics (SBBN), the SBBN-predicted abundances depend on only one adjustableparameter, the baryon density parameter (the ratio by number of baryons(nucleons) to photons). The predicted and observed abundances of the reliclight elements are reviewed, testing the internal consistency of primordialnucleosynthesis. The consistency of BBN is also explored by comparing thevalues of the cosmological parameters inferred from primordial nucleosynthesisfor the standard model and for models with non-standard early Universeexpansion rates with those determined from studies of the cosmic backgroundradiation, which provides a snapshot of the Universe some 400 thousand yearsafter BBN ended.

Primordial Nucleosynthesis: The Predicted and Observed Abundances and Their Consequences