Summary
By reanalysing the observations of the4He abundance, it is shown that the primordial component by mass fraction should have an upper bound as 0.23 and that it is in discrepancy with the predictions of the standard hot-big-bang model. A small degeneracy of the electron type of neutrinos can, however, remove the inconsistency. Various implications of such a solution are also discussed.
Riassunto
Rianalizzando le osservazioni della quantità di4He, si mostra che il componente primordiale per frazione di massa dovrebbe avere un limite superiore 0.23, e con ciò è in discrepanza con le previsioni del modello standard di big bang bollente. Una piccola degenerazione del tipo elettronico di neutrini può, comunque, rimuovere l’incoerenza. Si discutono anche le varie implicazioni di una tale soluzione.
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Rana, N.C. Abundance of light elements and lepton asymmetry. Nuov Cim B 84, 53–64 (1984). https://doi.org/10.1007/BF02721648
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DOI: https://doi.org/10.1007/BF02721648