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/

Global: Zendy Plus annual

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

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We report the results on Big Bang Nucleosynthesis (BBN) based on an updatedcode, with accuracy of the order of 0.1% on He4 abundance, compared with thepredictions of other recent similar analysis. We discuss the compatibility ofthe theoretical results, for vanishing neutrino chemical potentials, with theobservational data. Bounds on the number of relativistic neutrinos and baryonabundance are obtained by a likelihood analysis. We also analyze the effect oflarge neutrino chemical potentials on primordial nucleosynthesis, motivated bythe recent results on the Cosmic Microwave Background Radiation spectrum. TheBBN exclusion plots for electron neutrino chemical potential and the effectivenumber of relativistic neutrinos are reported. We find that the standard BBNseems to be only marginally in agreement with the recent BOOMERANG and MAXIMA-1results, while the agreement is much better for degenerate BBN scenarios forlarge effective number of neutrinos, N_\nu \sim 10.Comment: LaTeX2e, 41 pages, 20 figures. Minor changes and 4 figures slightly  modifie

The standard and degenerate primordial nucleosynthesis versus recent experimental data