The standard and degenerate primordial nucleosynthesis versus recent experimental data View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2000-09-22

AUTHORS

Salvatore Esposito, Gianpiero Mangano, Gennaro Miele, Ofelia Pisanti

ABSTRACT

We report the results on Big Bang Nucleosynthesis (BBN) based on an updated code, with accuracy of the order of 0.1 % on 4He abundance, compared with the predictions of other recent similar analysis. We discuss the compatibility of the theoretical results, for vanishing neutrino chemical potentials, with the observational data. Bounds on the number of relativistic neutrinos and baryon abundance are obtained by a likelihood analysis. We also analyze the effect of large neutrino chemical potentials on primordial nucleosynthesis, motivated by the recent results on the Cosmic Microwave Background Radiation spectrum. The BBN exclusion plots for electron neutrino chemical potential and the effective number of relativistic neutrinos are reported. We find that the standard BBN seems to be only marginally in agreement with the recent BOOMERANG and MAXIMA-1 results, while the agreement is much better for degenerate BBN scenarios for large effective number of neutrinos, Nν ~ 10. For the low D data, standard BBN is still viable for η ~ (5÷6) 10−10. More... »

PAGES

038

Identifiers

URI

http://scigraph.springernature.com/pub.10.1088/1126-6708/2000/09/038

DOI

http://dx.doi.org/10.1088/1126-6708/2000/09/038

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1028772557


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